Cool update man, really. Love it will test it.
For cannon thing - You need to set up cannon and leave it for 20minutes on ground standing. Most likely you need to shoot with it to break it.
Sand crabs plugin - So i found my account in Ship that ships you from Port Sarim to Kourend trying to click somewhere on minimap. Debug was full of error - trying to reach bank - can't. Trying again. Couldn't see what was the start of this bug as logger was full of that (going to bank, can't find bank) error. Btw, it had 2 Lobs in inventory left, so I assume it did not tryed to do banking because of out of food.
EDIT - Running 184.5. Sand crabs - would not drink supercombat pots.
EDITv2 - Anti-crash for Sand Crabs would be nice. Right now it would do nothing if someone crash you or you crash someone after coming back from break.