I already showed this to Player at BTM16 2.0, but I thought I should eventually post it here too, to get other's opinions on this idea
The idea: An additional upgrade that allows players to assign sides of the machine to one or more specific slots, not unlike CoFH did in Thermal Expansion, but still different.
It is explained relatively nice in this picture I made:
There's also a .psd version of this with layers: DOWNLOAD
This also disables normal side associations, and should be avialable for every block in IC2 which has an inventory with slots.
Player also said that, after converting to the new XML machine GUI system, this would be "reasonably doable"
I know this wouldn't have that much uses, but it would be still useful