I think this post illuminates a problem with Logic's multi-timbral architecture. To have the ability to control the multiple outputs of a multi-instrument completely independently and without any restrictions would be very nice indeed. Unfortunately it seems that Logic is not capable of this yet.
Something I'd like to see in the future is unlimited mono and stereo outs for a multi instrument. As many or as few as needed. Right now Everything is limited to a certain amount of outs. Ultrabeat, for example, can only allow 8 stereo and 8 mono outs as its oneand only multi-out option.
I would like to be able to have 25 stereo outs (seeing as there are 25 different synths in one instance of Ultrabeat) if I felt like it, or any combination of mono and stereo outs decided by the user, not the program. This would be a little slice of heaven for me personally as I like to separate all my drum sounds out on different mixer channels.
Another example would be 128 different outputs, each one either mono or stereo, for battery 3, as 128 is the maximum amount of cells available in that program.
Would I use all of them? Probably not for a while. But if the architecture is set up in this manner, then any level of programming I do will be completely flexible. It would be the same for say, 11 sounds, as it would be for 128.
Just my 2 cents.