Another minor suggestion I have that would be useful at least to me. A shortcut to the last launch logs. If you could put a dropdown box showing just the last ones, not the backups would be awesome (just the ones matching Launch(_[0-9]+)?.log .. or something like that)
Those extra options work with Unreal Frontend because it doesn't add a space between the map name and the extra options box.
UDK Frontend does add a space, so to make it work, you'd need to write 'MapName?game=cqb.cqbteamgame' in the 'Map To Play' box. Add '-alladmin' to the 'Extra Options' box, then just press the Server button which adds the ?listen flag automatically.
I just dl'ed and set up this custom front end. This is an excellent replacement for the offical front end for those who are custom to the older version of it.
One small change you might want consider is to rename the application from just being "UDK Frontend" to something slightly different so that others understand this is a custom Frontend package. Just a though to consider.
I'd like to get the 32 bit/64 bit options fixed, since you currently launch it "properly" and let the game decide which executable to fire off. It is nice, except there are certain things that don't work in 64 bit, such as Steam interface