Yeah. I'd written a simple utility for a friend of mine to solve this problem. This tiny assembler hack set the FASTMEM flag on the CHIPMEM chunk, so the system apparently sees the RAM twice (not really, but Workbench does). Surprisingly (or not so) this caused zero problems since all allocated mem was allocated from both lists - which are always identical, of course.
Back to mongo's post: he's completely right, there's definitely no way to move the RAM address ($080000 to $C00000) without modifying the board jumpers (or maybe an MMU). It simply is physically impossible. :roll: