I just updated to your new module, thanks mate :)
When I was talking about cancelling a bid, I meant if someone using Bidder changed their mind and wanted to cancel their bid. Our test group couldn't find a way.
With the negatives, we were running bidding so that people bid on all items at once. One of our test bidders placed a bid on 2 items that individually were less than his total amount, but when added together well exceeded his DKP. When I awarded the items to him, his total just went into the negatives.
We were just wondering if there was a failsafe we could implement to prevent this from ocurring.