Could fingerprints potentially be changed using a gene gun?
Chimpanzees have fingerprints.  Next all you have to do is find the homologue of SMARCAD1 and let the animal testing begin!  But actually I doubt it will work.  This website goes into some depth and links some additional sources that show fingerprints are developed in the womb and are fully set by 6 months of gestation.  

It seems likely that SMARCAD1 may have to do with having fingerprints or not, but not likely that it has anything to do with their composition.  It would be difficult for one gene to have enough variation to provide 6 billion variations in output.  You could hypothesize that it's a combinatorial output from other genes as well, but the studies linked above focus more on environmental interaction as the cause of variation.

I would guess that the patterns are set and no amount of gene therapy is going to change your fingerprints.  The simplest experiment would be to knockout the above gene in an adult for some period of time and see if the fingerprints fade.