1st I like some added traction, 2nd, it can be done in several ways, stippling with a wood burning tool or soldering iron, decals, appliques or slip on enhancements, the stick on stuff can be skateboard tape, and I'm not against it, it works and can be removed later. There is one provider that has a stick on, nearly suede like material, that feels very comfortable. 3rd there is a spray on finish, with abrasive in the mix, that I think is outstanding.
See here.
http://www.gripreductions.com/Here is a picture of my 34, stippled and it feels great, but is not reversable.