Select and then highlight works fine. But even better, I think, would be to adopt the NoteTaker method: command+drag operates exactly like ordinary dragging, but instead of selecting, it highlights. And the highlight isn’t fixed until mouseUp so you can back-and-forth to get it right.
Just one of those tiny things that smooths the UI, though some may disagree.
RELATED DESIDERATUM: Now if we could have something which (a) found all highlights or a given colour [which we can do already, -ish, but this should find the lot, in one go] and (b) copy the highlighted text to a new document… well, that would be very powerful but, I suspect, quite tricky. (Both NoteTaker and CP Notebook do something along these lines, but both blow it at the last moment by “gathering” any entry that has a highlighted bit anywhere in it. I highlight a few lines in a 2,000 word research document, I don’t want the whole damn thing reproduced in )my new “highlighted bits” doc. I just want the bits I, er, highlighted.