A question about SAM picker

You'll be arrested.

wait, who's gonna pick me? Am I going to be abducted :O Will I have to participate in the starving games?

and from what I heard, I think you can get a VAC ban for using SAM (the app)

Only the steam support can remove playtime.

I am pretty much sure doing so on any VAC protected games can get you banned. I am not sure about other games, however I doubt your account would be affected if it was a non VAC game.

You CAN edit those statistics with SAM but you should NEVER DECREASE VALUES. This is very likely to get you banned. Increasing values can work, but decreasing is almost an instaban.

Fiddling with VAC protected games is NEVER safe, that's all I can tell, and unless you ask Valve support directly that's as accurate as it gets.