If it works for you and you can achieve your intended level of accuracy, speed and repeatability, go with it. I stippled the left side of the trigger guard on my XD because I find it comfortable to rest my left thumb against it while shooting. My thumb would touch that spot anyway so I went a head and integrated it purposefully into my grip. It allows me to have a target spot for both of my hands so that I grip the weapon the exact same way every time, increasing repeatablity. In short, do what works AS LONG AS IT REALLY WORKS. Often times we think something works but find it keeps us from evolving into a better shooter. As long as what your doing isn't holding you back from becoming better than I say more power to you.
Be polite. Be professional. Have a plan to kill everyone you meet. Semper Fi.
A man who feels he must ask for freedom surrenders it by doing so.
I am a Man and for that no apology is offered.