Auto-promotion when time remaining < 20 seconds

I think this is a better criterion for auto-promotion than the current one (which allows you to promote automatically when premoving) because sometimes in fast games you fail to premove fast enough before your opponent makes their move and you might lose a lot of time during manual promotion. Case in point:http://en.lichess.org/GwIVrAPatYAu where i failed to premove my 54th move in time, and my time ran out as a result

Agree.

yeah. we could have a system where you could allow for user to select premoving as a criterion for auto queening and also select a time criterion for auto queening for example if you have less than 15 seconds. Would be pretty useful IMO.