It'd be handy to have the option to set the quality of a 3D comp for both the comp viewer and the final output; when working with heavy 3D comps, it'd be nice to see a rough view in the comp viewer, but to know that when I send it to render, AE will use a better quality output. I know "Draft 3D" exists, but this does not seem to make much difference to the redraw speed.
On a similar note, I'd like to see "render only" layers (I've feature-requested this before, a long time ago) which work in the opposite way to "guide layers" - ie. they only show up when rendering, not previewing a comp. This would be handy for things like motion blur, colour grades, etc. which can slow down a redraw, so one turns them off...and has to remember (hopefully) to turn them back on again when rendering.