Let's throw some words around then like unfair advantage, cheating, not playing in the spirit of the game. Maybe the bowler can tamper with ball in these games too and should be ok, oh I don't know maybe even give them some polish to keep the shine or hang on let's let the batsmen glue the bails on
Errr, in my competition every team including my own has a bowler who throws (bowls with a bent arm) the ball rather than bowls.
Most teams have a player that uses the Gray Nicolls Fusion with a carbon handle.
Every team has an Indian batsman that uses the Lams brother - the double wood bat.
Since Murali was cleared of any wrong doing and bowling with a bent arm became legal, as far as I am concerned, in cricket, everything is legal.
Bowlers pick the seams without complaint from the umpire.
John Lever used vaseline to keep the ball shiney - and the MCC said it was OK.
Botham and Lamb accused the Pakistanis of being cheats because Waqar and Akram could make the ball reverse after 40 overs - which is impossible they said, and went to court to fight it.
In the 2005 Ashes, Flintoff and Jones could make the ball reverse violently after 15 overs (with the aid of mints), apparently, unlike the Pakistani's, this was a God given skill.
Would I feel guilty using a Lam?
No.