I agree with the request. It would be great if the KPA could allow users to disable the cab sim for the direct out. Or at least add an EQ so that the sound change due to the cab sim can be compensated for.
My workaround so far consists of sending a stereo signal through monitor out (Master Left, cab off) and direct out (Master right) into a Palmer Macht 402 and adjust its EQ for the direct out signal, cutting some bass and adding some treble. Not ideal, but it allows me to keep the cab on for main outs to FOH and have a (more than) decent stereo monitor sound on stage. 