I've had something similar in my X because I have the SubX. I was in the same boat as Steve and was thinking how am I gonna deal with this problem? That's when I met a member at XFeast 2010 @ Williamsburg and he gave me hi seat extension for my daughters car seat.
I keep a 10mm socket, extension, ratchet and a Phillips head screw driver in my truck at all times so that I can take the center console out, move the SubX out of the way so that I can get to the spare tire tools. I've only had to get into there once since having this setup for 2+ years