What I'd like Reason to have -

[Oquasec]

They have a brush tool already in the sequencer for some reason even though the utilities do most of that.
The utilities section does a looooootta shit.

[Boombastix]

I'd like Reason to start being used by the developers so they understand how clunky and frustrating it is to work with, and decide to actually fix it.

I am convinced that nobody there in the design or implementation team uses Reason very much at all.

While I'm loading this thread with mock-ups.. here's one I posted in a thread a while ago. An automation curve library ! Who knows, this thread might be the one they take action on

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get_curves.png

Yeah, that's great. Also, save your own created curve clips.
FL Studio and Cubase has nice ways to manipulate the rate and amplitude. IIRC Cubase can skew the curves so you can do fade ins and stuff. Automation is such huge part of production and not far behind composition when it comes to importance to the final results.