A Noisegate/Noise reduction DSP would be a great addition for those who use “real” instruments with ReNoise, I guess
a ‘Dub’ style echo box delay would be nice to have as a built in renoise DSP! with filters and everything
Are you talking statistical noise reduction, or simple threshold noise gating? 'Cause there’s already a noise gate called “Gate2” 
[x] sidechain 
FTW!
Other then some amplitude demodulator (sidechaining) device, I’d rather have more patterncommands. There are tons of vst already that can do all your dub dub dub noodlings 
You know, if we only had proper routing, all of this would be possible with simple VSTs 
Well, there are VSTs for everything, so we could easily go to an extreme and say we need no built-in DSPs at all. What I mean (and happy_milkshake_man, I guess) is that the built-in delay, the way that it is now, is suboptimal.
Embedding internally the filter device in the delay’s feedback chain (similar to the way it’s embeded in the flanger and chorus) is a little change. Or, at least, it appears to be such on the surface. And with all the different types of filters available, it would result in quite a versatile and powerful delay unit.
I find the distortion suboptimal. Would love to have a built in sound destructor akin to Reason’s Scream. 
Side-chaining would really make a difference, tho.
I’m pretty sure the 2 prerequsites for DSPs are that they are:
-
Very light on processor use
and - Contain as few parameters as possible, whilst still giving a lot of control
So, my thought is that with adding a filter to the delay, you’d be adding at least 3 parameters, and increasing the processor load significantly… but I could be wrong
Also, with Scream-like distortion, you’re again looking at potentially processor intense calculations, and more parameters.
Perhaps you can convince Taktik to make these additional DSPs to the current ones, but somehow I doubt it will happen.