No idea if this is technically possible, but here goes nothin’…
It would be nice if you could use an input socket directly as a source for a sidechain, rather than having to select an input channel. The particular use-case I’m thinking about is when you have a set of drum triggers simply being used as the source of a sidechain for gates. I don’t feel like I actually need any of the processing that a channel provides for the trigger signal itself, so it’s kind of a shame to waste it.
One way to achieve this might be to make the dedicated FX returns “assignable”, since they have limited processing (I use full channels for my FX returns because I like being able to use gating/ducking and compression). Might make that it’s own request…