Sure would be nice to be able to copy a task from another job/plan while editing a bamboo job. We have separate builds for environments, and everytime I make a change to one, I need to make the same change in five other plans. The autocomplete is helpful but it would be really nice to be able to do a copy function quickly.
Another thing that would be handy is a list of plan/branch/global variables that displays in a sidebar while editing a task. (or autocomplete on bamboo variable entry in a script or command). I can never remember whether I used ${bamboo.jiraticketnbr} or ${bamboo.jiraticketnumber} or ${bamboo.jira.ticket.number} etc. I could of course come up with a standard way of doing things but that's asking a lot. 
Love the product, just had some suggestions that didn't look like something I should put in a support ticket.