MXMLC not supporting compiler.advanced-telemetry

Super late reply here, but I believe the issue is that the mxmlc flex task doesn't support the advanced-telemetry option, not that mxmlc doesn't support it. In unpacking the <AIR_SDK_PATH>ant\lib\flexTasks.jar, there's a MXMLCTask.class file with the following options (hacked into a readable list from decompiled java code):

private static final ConfigVariable[] CONFIG_VARIABLES = { new ConfigBoolean(new

  ("benchmark")), new ConfigBoolean(new

  ("compiler.accessible")), new ConfigBoolean(new

  ("compiler.debug")), new ConfigBoolean(new

  ("compiler.incremental")), new ConfigBoolean(new

  ("compiler.mobile")), new ConfigBoolean(new

  ("compiler.optimize")), new ConfigBoolean(new

  ("compiler.report-invalid-styles-as-warnings")), new ConfigBoolean(new

  ("compiler.report-missing-required-skin-parts-as-warnings")), new ConfigBoolean(new

  ("compiler.show-actionscript-warnings")), new ConfigBoolean(new

  ("compiler.show-binding-warnings")), new ConfigBoolean(new

  ("compiler.show-deprecation-warnings")), new ConfigBoolean(new

  ("compiler.show-invalid-css-property-warnings")), new ConfigBoolean(new

  ("compiler.show-unused-type-selector-warnings")), new ConfigBoolean(new

  ("compiler.strict")), new ConfigBoolean(new

  ("compiler.use-resource-bundle-metadata")), new ConfigBoolean(new

  ("remove-unused-rsls")), new ConfigBoolean(new

  ("use-network")), new ConfigBoolean(new

  ("warnings")), new ConfigBoolean(new

  ("compiler.allow-source-path-overlap")), new ConfigBoolean(new

  ("compiler.as3")), new ConfigBoolean(new

  ("compiler.doc")), new ConfigBoolean(new

  ("compiler.es")), new ConfigBoolean(new

  ("compiler.generate-abstract-syntax-tree")), new ConfigBoolean(new

  ("compiler.headless-server")), new ConfigBoolean(new

  ("compiler.isolate-styles")), new ConfigBoolean(new

  ("compiler.keep-all-type-selectors")), new ConfigBoolean(new

  ("compiler.keep-generated-actionscript", "keep")), new ConfigBoolean(new

  ("compiler.verbose-stacktraces")), new ConfigBoolean(new

  ("compiler.warn-array-tostring-changes")), new ConfigBoolean(new

  ("compiler.warn-assignment-within-conditional")), new ConfigBoolean(new

  ("compiler.warn-bad-array-cast")), new ConfigBoolean(new

  ("compiler.warn-bad-bool-assignment")), new ConfigBoolean(new

  ("compiler.warn-bad-date-cast")), new ConfigBoolean(new

  ("compiler.warn-bad-es3-type-method")), new ConfigBoolean(new

  ("compiler.warn-bad-es3-type-prop")), new ConfigBoolean(new

  ("compiler.warn-bad-nan-comparison")), new ConfigBoolean(new

  ("compiler.warn-bad-null-assignment")), new ConfigBoolean(new

  ("compiler.warn-bad-null-comparison")), new ConfigBoolean(new

  ("compiler.warn-bad-undefined-comparison")), new ConfigBoolean(new

  ("compiler.warn-boolean-constructor-with-no-args")), new ConfigBoolean(new

  ("compiler.warn-changes-in-resolve")), new ConfigBoolean(new

  ("compiler.warn-class-is-sealed")), new ConfigBoolean(new

  ("compiler.warn-const-not-initialized")), new ConfigBoolean(new

  ("compiler.warn-constructor-returns-value")), new ConfigBoolean(new

  ("compiler.warn-deprecated-event-handler-error")), new ConfigBoolean(new

  ("compiler.warn-deprecated-function-error")), new ConfigBoolean(new

  ("compiler.warn-deprecated-property-error")), new ConfigBoolean(new

  ("compiler.warn-duplicate-argument-names")), new ConfigBoolean(new

  ("compiler.warn-duplicate-variable-def")), new ConfigBoolean(new

  ("compiler.warn-for-var-in-changes")), new ConfigBoolean(new

  ("compiler.warn-import-hides-classes")), new ConfigBoolean(new

  ("compiler.warn-instance-of-changes")), new ConfigBoolean(new

  ("compiler.warn-internal-error")), new ConfigBoolean(new

  ("compiler.warn-level-not-supported")), new ConfigBoolean(new

  ("compiler.warn-missing-namespace-decl")), new ConfigBoolean(new

  ("compiler.warn-negative-uint-literal")), new ConfigBoolean(new

  ("compiler.warn-no-constructor")), new ConfigBoolean(new

  ("compiler.warn-no-explicit-super-call-in-constructor")), new ConfigBoolean(new

  ("compiler.warn-no-type-decl")), new ConfigBoolean(new

  ("compiler.warn-number-from-string-changes")), new ConfigBoolean(new

  ("compiler.warn-scoping-change-in-this")), new ConfigBoolean(new

  ("compiler.warn-slow-text-field-addition")), new ConfigBoolean(new

  ("compiler.warn-unlikely-function-value")), new ConfigBoolean(new

  ("compiler.warn-xml-class-has-changed")), new ConfigBoolean(new

  ("static-link-runtime-shared-libraries", "static-rsls")), new ConfigBoolean(new

  ("verify-digests")), new ConfigBoolean(new

  ("use-direct-blit")), new ConfigBoolean(new

  ("use-gpu")), new ConfigBoolean(new

  ("flex")), new ConfigBoolean(new

  ("inline")), new ConfigString(new

  ("compiler.actionscript-file-encoding")), new ConfigString(new

  ("compiler.context-root")), new ConfigString(new

  ("compiler.defaults-css-url")), new ConfigString(new

  ("compiler.locale")), new ConfigString(new

  ("compiler.mxml.compatibility-version")), new ConfigString(new

  ("compiler.services")), new ConfigString(new

  ("debug-password")), new ConfigString(new

  ("dump-config")), new ConfigString(new

  ("link-report")), new ConfigString(new

  ("load-externs")), new ConfigString(new

  ("output", "o")), new ConfigString(new

  ("raw-metadata")), new ConfigString(new

  ("resource-bundle-list")), new ConfigString(new

  ("size-report")), new ConfigString(new

  ("target-player")), new ConfigString(new

  ("tools-locale")), new ConfigAppendString(new

  ("configname")), new ConfigInt(new

  ("default-background-color")), new ConfigInt(new

  ("default-frame-rate")), new ConfigInt(new

  ("swf-version")) };

advanced-telemetry is notably missing.