So, earlier today I accidentally bid on something that cost 8k crowns and I totally didn't want it, and I couldn't find anyway to cancel the bid or anything. I actually had to find someone that was willing to outbid me to solve the problem.
So, simple idea: A: you can cancel a bid, effectively giving you your money back and acting like it never happened, or B: a warning message appears before you bid, informing you that it will take your money immediately and you can't turn back. Of course, this warning would have a "Don't show me this again" message for those people that bid all the time.
This would just be a really nice feature for poor saps like me.
Accidentally bidding is entirely your fault and you have to take responsibility. You also put no thought at all into how an unbid feature would affect the AH. A warning before bidding is just an irritant and messes with bidding wars are snipe bidding. If everyone would instantly turn it off, why have it in the first place?