I think both have points..
yes its nice to have it number sorted if you want to group the templates in the list and not beeing forced to have some strange name prefix... But having a category (maybe optional) would be cool. Then you can group sections of the site that you have in template categories.. and have it sorted by name within those. That would be real nice.
Some sites have loads of templates and structuring them a bit might be nice without beeing forces setting numbers on all templates..
It seems Anders is the one that found sites with numbered pagetypes? (lucky you)
Perhaps the default sorting order could be a config option?
Ability to group pagetypes would be excellent yes. Right now I'm creating pagetypes with name like
to act as a separator in the list. Ugly as hell but works :)
I haven't seen a site yet where the number on the pagetypes made any sense. So changing it to list on name by default would save clicks!