You can define your own playing techniques, but you can’t define things like dynamics, or bits of text that describe structural events in the music. Hopefully it’s not too hard to type the word “Bridge” into a Shift+Alt+X text item, though?
For sections, I tend to use extra text in rehearsal marks for more commercial work (instead of having rehearsal marks and boxed text negotiating collisions). But of course it depends on the client.