As Jed pointed out, you can change
http://tiddlywiki.com/#%24%3A%2Fcore%2Fui%2FEditTemplate%2Ffields there is a +sort[title].
The problem is, that there is _no_ other parameter you can use for sorting. Fields are no tiddlers. So there is no meta data, like "modified" or "modifier", that could be used for sorting.
It would be possible, that you add one tiddler per field-name, tag them, and use the tag-tiddler's
list field for sorting. ... but that's probably not what you want. .. It depends on the number of different fields, that you have. If there are just a view, it would be easy that way. .. but still needs to modify the edit template.
have fun!
mario