changing the sights I seriously doubt will do anything to the warranty, since changing the stock is just as much if not more, and won't affect your warranty.
Filing down the front post, then sending it in for warranty work for not shooting straight would probably make replacing the front sight a non warranty repair.
Reading your other posts, honestly, your sarcasm wasn't readily apparent as it is here, you do loose a lot of inflection when you type what you'd normally say.
But what I'd suggest, is shooting it 'out of the box' condition, after cleaning and oiling appropriately, then look for any issues. The 'hump' you're concerned with can also simply be the finish wearing from the inside of the revceiver. I don't find it abnormal at all after 450 rounds.
When I've called Sig CS, I've never been dissapointed, and in fact, found them to go beyond my expectations. Ymmv.
Just go shoot it, clean and inspect it, and have fun.