I'm sorry, but I can't understand what world people live in when they consider a Glock trigger pull "long".
I also can't understand the point of buying a Glock and trying to "improve" the trigger feel. It's like trying to soup up a Ford Taurus. Just doesn't make sense. The Ford Taurus does it's job extremely well, but if you want something sportier, you are better of just getting that to begin with.
There are so many great polymer pistols out there that have good (amazing in the case of the Walthers) triggers out-of-the box. These include the Walther PPQ & P99, various CZs, M&Ps with new-style triggers, XDm, SR9C, Caracal, etc.
But to each his own.