If you look at the slide stop you will see the engagement angles aren't conducive to easily releasing the slide under pressure.
As the stop wears the angle softens and the stop is easier to move under the recoil spring pressure.
If you wanted to make the slide stop easier to use as a slide release, you would file the angle of the stop so it slide away from the slide easily. Then polish it.
The problem then is you are depending much more on the magazine spring pressure to hold your slide stop in place. Right now you can lock open the slide and remove the magazine and the slide stays open. Filing the stop or using it continually as a release will soften the bite the stop has on the slide and you will have a gun that the slide may not stay open on.
I use my slide stops as releases all the time, I know, I'm bad. A lot of guys have broken the slide stops, I never have.
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