I've switched my P07 from decocker to safety twice. Once, before polishing, and again afterward. Before polishing, the trigger on my P07 was terrible and I almost left it with the FFL for return, but figured it might "break in" after use. Converting it to safety operation made no difference at all, so I returned it to it's original state.
After the first 500 rounds and some thorough cleanings, some of the "crunchies" disappeared, but it was still not much fun to shoot. With the technical information and encouragement I found in this forum, I performed a complete polishing of the pistols internals. and have wound up with a very nice shooting P07.
Remembering that others claimed an improvement by converting to safety, I tried it again, but still did not see enough change to offset my preference for the decocker.
Over 5000 rounds later, I've got a pistol that's fun to shoot, and extremely reliable in it's original configuration. My Wife's P07 (ODG) was an absolutely sweet shooter right out of box, and has just gotten smoother after 3000+ rounds. She tried my pistol in both configurations, and agreed that there was no significant difference.
All that being said, I acknowledge that every pistol off an assembly line is a unique machine !!!