Hi Perrry
".......I'd just go to Add Blank, pick whichever color of background that I want, drop that into the Track and then type whatever I want in Subtitles. ......"
That works fine but means an extra step...and uses two tracks. 🙂 It's far simpler (as you are going there anyway) to designate a Full Background colour when you write the text.
Subtitles are a another case. If so designated, subtitle text is placed in a coloured background which is equivalent to the Text Background setting when entering Text.
Nat