Been thinking for a while that it would be great to be able to order an object's fields alphabetically if desired. Having said this, I would probably want a degree of flexibility (ie. ability to keep a particular field at the top) so if it could be a flexible 'one-off' type of sort that could be manually overridden afterwards that'd be good.
Also, with multiple choice fields, auto-alphabetising would be great. (While I'm here, I think you used to be able to reorder multi-choice fields by drag and drop, I think now you can only reorder by using 'quick edit' which involves copying and pasting and is a bit of a drag).