Barney
Not sure if you were a controller at Boundary Bay or a Centre Controller, but as a controller from
CYKF I certainly use similar phraseology.
I don't use the exact phraseology you mention, but often say something like "keep your speed up" or "keep your speed up, faster aircraft behind you".
I'm not sure I'd ever assume that every pilot wants to get on the ground and off the runway as quickly as possible. Anyway, what I'm trying to do is to impress upon the "slower" aircraft that I need his/her airspace and the runway as soon as possible. It only takes a second or two for the transmission, and keeps everyone informed as to what's happening.
I’m sure you had plenty of situations in your career when it was getting a little tight on final, and to make it work you had to prod the slower aircraft to go as fast as he could, and land so as to get off the runway and onto a taxiway as quickly as possible.
I suspect this, or some variation of this situation, is what the controller at ZBB is trying to accomplish.
Hope you are enjoying retirement.
Cheers
Peter