One small thing; I had both a rune pickaxe and black pickaxe (for RC) in my bank. When it was banking ores it deposited the rune pickaxe (don't have 40 attack to wield) and after depositing it the bot withdrew the black pickaxe. Can you make it withdraw the best available (and best possible for level) pickaxe? This would also let people start with 30 mining and mithril pickaxe, then it would change to adamant at level 31, rune at level 41 etc.
Also: on the north-west part when going to/from the main (cleaning) area, there are two rocks. It tried to mine the furthest rock while getting stuck behind the first. I think (not sure at all) this occurs when the rock falls just right before you try to pass it.