Sup.
Do you have those times when you think to yourself, "Jeez, I wish someone would think about this and code it?"
I do. A lot. So let's share. Maybe someone enterprising will pick up on some of the ideas and start working on that stuff. Or maybe we'll just get to talk about cool stuff. Whatever.
From me:
Frequency splitter - It would split the input signal into 'bands,' then send them to separate channels. Benefits? You can approach mastering stuff with much more freedom and directness. You're not limited to multiband compressors, MB stereo enhancers, MB saturators, and all that—you can use any of your single band effects on a selected range of frequencies and fine-tune them with ease. I have done some searching before and found a freeware vst like that, but it didn't work with Cubase at all. Of course you could set that sorta stuff yourself by sending things to various channels and filtering them, but let's face it—that's tedious and might not sum perfectly.
Multiband panner - yeah, this isn't nearly as useful, and could be achieved easily enough with the splitter idea. But it could be good for improving bad mixes and remastering old mono records. Stereo enhancers are great for those things, but they always result in the sounds being sorta symmetrical. This would let you aim for the most important frequencies of an instrument and nudge it a bit off-center, then take something higher and push it in the opposite direction - and viola, the image is more stereo, and not in the "everything goes through both speakers with equal volume, but one side is delayed a bit" way.