I think it is good airmanship, even in highly ergonomic cockpits such as the 320, with Take of and Landing Memos and the way the checklist are designed, so you check take off config well before the rush of the cleared for inmediate take off, or after a similar rush in short final.
Maybe one day the Memo has some important blue line pending and in the rush you miss it.
Both checklists and actions triggered by conditions or other actions can be missed by unexpected events, such as LOC failure or just an ATC ususual transmission or instruction. So the late checks are a good idea, and good airmanship in my opinion.
But this "home made" checks have to be made always. Specially when things are rushing. Otherwise they are quite useless, as the normal checks and call outs are enough.
As Framer says, keep it to yourselves, or every FO would have to learn each Captain's home made last checks. Please don't mumble nor say alound things about flaps, gear, spoilers in short final. It is distracting.
cheers