Polo Rules

or even pinning it to ensure a win nearer the end of a game instead of playing the ball.

We have a game delay penalty for this already (ball turnover to the other team if you pin the ball), although most teams just dribble the ball around their own half if the game has little time left (not much you can do about that).

Icing isn't much of a problem yet in my opinion as you're already giving up possession by making that move?

I agree that writing rules against double goalie tactics seems very targeted/bias, but people have been heckling the shite out of double goalies for over a year now and they're still holding their ground, solid as a rock and (in my opinion) all that has changed to combat double goalies is to go in and "break up the D" with very aggressive/dirty play off the ball.