Now there is an 'Offset Type' dropdown on tool shelf with types: Offset - current method, offset of new edge from old along sliding face Width - width of new bevel face (if segments=1) Depth - amount a chamfering plane moves down from original edge Percent - percent of way sliding edges move along their adjacent edges The different options mainly are useful when beveling more than one edge at once. Leaving as a TODO to put these in the modifier, as doing that has more permanent effects so want to let users shake out problems with this first.