There's a fix for the rear door/alarm/remote lock system quirk... Tone's rear door popper kit. The kit will let you wire the rear door into the interior light circuit, which will do three handy things:

1. Opening the rear door will trigger the alarm (if it's activated)
2. If you unlock the VX with the remote, then open the back door, the system will not relock the front doors on you while you load your groceries
3. Opening the rear door will activate the interior dome light

I just got my kit in the mail last week, but I haven't hooked it up yet.