Actually, a number of people use this method on a 1911, or something simular, like pinning or disabeling---one used a rawhide string.
I have mine fixed so they are very light.
Now, if you have big mitts it is a good way to get a bigger grip.
Skateboard tape is good as a retention device.
I don't have much problem with retention but I do like checkering on the front strap.
I do like grips that have texture.
On a Kel-Tec I would suspect it is a good idea.
Blessings