One thing that drives me nuts is the context menu item order when a name contains a possible abbreviation:
Because I'm so used to the first option being "rename to" I end up alt-enter entering right through it. Then I have to go into options and remove the abbrevation (and I can never seem to rember where that option is at). IMO it would be much better if the "rename to" item was always *first* and the abbreviation item was second. It seems that the abbreviation item is not going to be the one that users will select most often so it would make sense that its second. In fact I don't think I've ever added an abbreviation, not sure if thats the norm though.