Actually it seems, from many discussion I've read, that Unicable/SCR LNBs are not compatible to motors because they seem not to support DiSEqC 1.2 commands.
Is not clear, though, if it's possible to use Universal outputs only to use the motor in those Unicable LNBs which are also provided with some Universal out but surely it'd be a bit hectic.
After all, is not very logical to use a motor with a Unicable because you risk to interfere with your recordings if another one starts on a different satellite.
A mixed system made by two dishes, one with Universal LNB and a motor, and another one fixed and equipped by a Unicable/SCR would be ideal (apart, of course, for the two dishes needed).