I'm not very well versed with the ways of the A3000, but recently I came into possession of one of those towers and did some research. it seems like the rom tower is for soft kicking the A3000 to kickstart 1.4. and it's possible to change this to soft kick another kickstart (by creating some special directories and stuff) but I forgot the exact procedure. The other two roms slots are for real A3000 roms (2.04 or 3.1).
rom tower is not necessary at all if you have 3.1 roms.
