Apologies if this has been mentioned before, but it would be a nice workflow enhancement to allow insert effects to be moved between slots or channels using drag and drop. If dropped onto another slot that already contains an effect, then moving that effect (and any effects below that) downwards to make room. That would mean reordering effects on the same channel would work too (by simply moving one effect to the effect above it, which would effectively swap them). You can do this kind of thing manually by right clicking and choosing existing effects from the menus, but it's not exactly speedy workflow that way.
Of course, with only 3 inserts available per channel, if you drop one on a channel that is already "full" then you'd have to ask whether to lose the bottom effect or overwrite the one you're dropping on... Or... extend the number of inserts dynamically [now, having more than 3 inserts must already have been mentioned in the wish list already, right? I assumed the limit was to not mess up the design of the mixer panel, but that already dynamically sizes width-wise as you add channels, and height-wise if you hide the EQ section]