Of course, I go and try something else right after that (something called the internet and searching)... this is what works:

Actions.Add(this.GetNextActionID(), "Create Event", "CreateAppt", "", "", " CreateAppt();", false, SecurityAccessLevel.Edit, true, false);

EDIT: it is stripping out something from my text, before the call to "CreateAppt();" it should have the word javascript written followed by the colon (:) but apparently the FCKEditor doesn't like that... thinks I'm trying to do some crossscripting or something. :)