With bigger games / demos comes more verbs, and sometimes set category just isn't enough. Which is why I would like to see the addition of default_verb_category. One of it could change a whole path of verbs into having it's own special tab. Similar to having many set category's lined up right after another for every single verb..
set default_verb_category = "One"
set default_verb_category = "Two"
Instead of having to specify set category = "" for each individual verb.
Of course, if set category is specified, it will overrule the default_verb_category for that one verb.
This could also replace the current client / default_verb_category which only specifies the default category for any verb which is assigned to them.