I'm not sure how the [Ahem. The new xenforo] warning system works, but I'm going to say this:
Hopefully, you have an alternate account to test this. Be careful with these warnings.
Once warned, the warning stays in your profile even though that the warning expires. This makes the next warning easier for mods to give out more points per warning. Just an F.Y.I.
I should know; at vB, this is the case.
[From the technical point - when the warning(s) expire - it's not removed from database, it stays there. Even when an administrator reverses it, the warning still stays there.]
What I am saying is that the warning system is almost like a tagging system from the mods' side.
From the mod's perspective - this may be the case: "Hm. This guy has been warned before, so let's give him more points to make his time here harder." I donno about you but that is abuse, IMHO.
Like I said, I do not know how the warning system works. I don't even know how it is designed compared to vB, but I am trying to exercise caution if you don't want to be banned quicker.
The mods may give you first-hand testing ground, but from the way vB handles warnings... I doubt deleting warnings is going to be a feature. In the future, mods will think you got warned in a serious offense [when in fact you were testing the warning system], so once again; just exercise caution.