Anyone have a M&P shield 40?

Just bought one locally / private. I am going to sell the Kahr. The MP has a thumb safety which is nothing short of miserable. I've searched, and get everything from "you are a weakling, practice," to "just don't use it" to "I agree it takes both hands"

1....Anyone aware of an aftermarket extended one?
2....I am considering removing it, and silver brazing "something" on there, if nothing else, just add some silver braze and file it.

Before you say, "just dont use it" this has what seems to be a more delicate trigger pull than the Kahr had, and I'm not sure I want that option. This is NOT a "DA only" even though that is kinda how it acts. It is a striker fired pistol with a lot heavier trigger than a SA

BOY IS IT SMALL!! BOY IS IT LIGHT WEIGHT!!
In Mopar General discussion?