Theplayground has a hidden feature that converts reason to rescript. (the settings, toggle RE/RES). Whatever is doing this, I'm assuming it could be incorporated into this plugin.

Highlight a Region
Command Pallet -> Convert highlighted Reason to ReScript
Command Pallet -> Convert highlighted Rescript to Reason

I would find this VERY helpful as I'm learning rescript and often have to look at reason resources. It could also be very useful for cut-n-paste programming