I almost always have a chain of FX units after a synth or sampler, and would love the facility to put all the modules into a single "group" module. So that I can minimise the group module leaving just one thing visible in the rack as opposed to minimising several modules and leaving the rack in a bitty mess. This especially annoying when using a vocoder or a audio spider.
I'd also really appreciate a simple notepad to jot down ideas or lyrics and be able to save them in the rns file, as opposed to having loads text files all over the place.
I'd also really love to have a dedicated LFO module with some complex LFO waves.