1) F6 Opens the color chip, can easily access eyedropper from that panel. There are finger gestures in app settings, but I have not managed to activate the color picker as suggested that way.
2) Press R then the ruler will rotate
3) Ctrl J is listed to hide current layer, but doesn't seem to work.
Generally suggestions should be sent to the Fresco UserVoice page for other users to vote and comment on. This is where developers look so they know what people want them to work on.
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