I have seen a KDF Tricorder I think it was an emote animation and I agree it should be used anytime you scan for something.
When I press "V" I do draw out a Klingon-style tricorder doin' some Klingonish beeps. However, I was referring to thos two or three guys next to the chancellor. They are scanning all the time, dunno for what (Undine-infiltrator-paranoia?!). But the do it wir FED-tricorders! And that kind of thing in the high council... na, that sucks^^