The absolute best remedy for gas that I've ever found is a slight change in diet. Try, for at least several day before you're going to play, eat only cauliflour, beans (kidney or pinto), and broccoli, and be sure to drink some whole milk, at least 16 oz., with this stuff. Works every time for me, make sure you try it
Well-Played, Sir.
As to this whole matter of gas-tactics. I do not think its really a valid concern. I don't see it as an effective means of sharking someone unless you are an artist about it. It has to be the kind of emission that would peel the varnish off the tables' apron in order for it to even be considered a sharking attempt.
There are much more subtle and effective means of psychically steering your opponent... if that is your goal. Playing music you know they do not like, slow lean while you are vaguely in their line of sight and they are shooting, litter the table with chalk dust and powder and leave the bridge half on the hooks or protruding from the holder in such a fashion that they have to fix it..... so many things to show your opponent how much you love them. Everyone has their favorite method of dealing with players that annoy them or otherwise deserve special weapons and tactics.
Regards,
Lesh