We really should stop using the word "realism", as it is far to easy to bend that word, and start using "historical accuracy" instead.
Just to make an example here: I could argue that Bunnyhopping is "realistic", because in the real world nothing would stop me from doing it, i can hop, it's easy enough.
But i could not argue that Bunnyhopping is a "historically accurate" tactic employed by soldiers of WWII, because that statement is demonstrably false and quite laughable.
Just food for thought gents.
EDIT: And i should reply to UsF on this aswell:
Yea I agree, splitting up the modes by mechanics sounds like a good idea, at least for the fans, but then you have the problem that a person can not be eased into the game via relaxed realism to then finally move onto realism, as they might be too different for people to enjoy. Im probably moving around in circles, but from what I understood, relaxed realism was intended to ease people into the game to finally move them to realism. Separating the fanbase down the line of game modes would create the problem of separating the community somewhat as well as increasing the balancing workload for the devs, because they would have to balance the game for two different game modes on each map.
You are forgetting one thing, namely that they don't have have to turn the "Realism" mode into the slower paced one, that is just one option they could choose.
Nothing's stopping them from adding a new mode, call it the "Ro1 mode" or the "Tactical" mode or whatever, for that matter they could add 2 new ones, the Tactical mode and the Tactical + HUD helper mode, this is perfectly possible (though it seems a little redundant to me, as i doubt there would be much demand for a Ro1-esque mode + HUDclutter).
And aslong as the new mode gets fair treatment by the server browser (IE we can actually find servers running this mode, and don't have to go dumpster diving amongst the "Custom" servers in hopes of finding one), then i don't think anyone would have any problems with adding this, thouse who aren't interested in playing it woulden't have to, and they would lose nothing, and thouse who do want to play it can play it. Who loses there? Who would it hurt?
As for map balance, i don't forsee many problems working with this, other games are doing it ("Standard" versus "Hardcore" modes) without headache, the modes would use quite similar mechanics and weapons (though a few be turned on or off for either), the main difference between them will be the pace of the gameplay and their feel, and that should not violently change map balancing, changes could probably be handled by toying around with reinforcement numbers if needed.