All of the templates can be edited easily. Mostly all they are is HTML. Don't be intimidated by the number of template files there are. But honestly IMHO, if you don't know HTML or have a general idea about how Perl and the variables work, you shouldn't be messing around with them anyway. Just make sure you know that stuff before you go playing around in there, or you might screw something up, which is usually a bad thing.
I'm not exactly sure what you're trying to get at, but here's a link to a topic where we discussed the functions of all the public templates and some other various stuff that you might find useful...
https://www.ubbdev.com/ubbcgi/ultimatebb.cgi?ubb=get_topic&f=17&t=000167 ---Skorpion