the "either 20 days or 5 levels - whichever comes first" restriction would be great ;P
wouldn't expect that. According to what Fizzer wrote:
Name changes are now allowed every 5 levels instead of every 20 days. This allows easy name changes when a player is new and not well-known, but makes them more infrequent for well-known players.
he want to reduce change name frequency and your idea goes opposite way :P