It would be incredibly useful to be able to pass arguments from OSC to Reascript. This would extend the functionality of a controller a lot, and bridge two different excellent parts of reaper.
It would also be great to be able to send OSC messages to controllers from inside Reascript, but this can already be done with PyOSC or a similar library, so the first request is more important.
BTW, is this still the right place to post FR and bugs? Is it read by the right people? Not complaining, just wondering.