No, not a rant about how great these two tactics are, just a note that the game I've just finished had two of the most perfect tactical justifications for each of these, in games I have played in so far.
My High Elf team, vs a Skaven team with a good one-turn scorer (MA 10, Blodge, Sprint and Sure Feet Gutter Runner, albeit only Ag 3). Score 1-1, I won the ball and could have scored on Turn 4 of the second half, but instead stalled and cleared out the defenders within range of me, and continued to stall by the back line. Even 1 turn could see an equaliser, and I would have the last turn of the match.
Rather than either complain in vain or attempt futilely to get past my 4 players defending the carrier, my opponent instead turned all his surviving players against my most valuable one, a +St Elf by the LOS and proceeded to Gang-foul him every single turn. A sending off would not hurt him at all in the circumstances, but an injury would leave me unhappy.
The brilliant threat in-game was made by him saying I could either choose to score early and risk it being 2-2, or watch my strong elf die. This nearly panicked me into scoring early, I'm not afraid of bashyness but I'd be tempted to rather accept a risk of draw than an injury I could do nothing to prevent on him (since he was always at least stunned) by someone with nothing left to lose.
Though in the end I chose to take the risk and stall anyway, still having my Apo until the end was a positive factor. A man of his word, he T16 fouled me, leaving me just to walk in the winner at the end.
People say fouling or stalling are "unsporting" tactics. Maybe, but they're good tactics. And kudos to him for not once complaining, but instead reaching for a good, dirty trick in order to try and have a chance to save the match.
If you want to see the match in question, its here:
http://fumbbl.com/FUMBBL.php?page=match&id=1794064