Unless I've misunderstood you, it's really not considered bad form at all. It's considered pretty standard amongst professional poker players that most everyone (at least the professionals) are all using some form of HUD (heads-up display) that will overlay stats next to each opponent's name, detailing all sorts of useful information about the player's tendencies. It's almost mandatory to use a HUD if you like to multi-table more than 4 tables at once.