I just set the front, center, and surround speakers to large on my 950. The sub is still listed as "on". That matches my expectation - that it is possible to set the 950 up with all channels full range while using a sub for the LFE track.

JulioCat, if your 950's behavior does not match this (starting out at all channels small and the sub on, then switching the channels to large without changing the sub's setting), I'd suggest contacting Outlaw's tech support.