The P40 is designed for concealed carry/personal protection. It has no external safety, thus the long trigger pull. To me, the trigger is similar to a DAO revolver trigger - though IMO better. I actually like the Kahr trigger for its designed purpose - though not for target shooting. In fact, the Kahr P9/40 was not designed for target shooting - though I do think it's amazingly accurate for a small DAO pistol.
The Kahr website has great info and accessories.
They list some custom work by Cylinder & Slide for steel & polymer frames:
And lots of accessories like holsters, grips, mags, etc.