TYY,
to answer your question from my personal experience, I have worked on both Ruger revolvers that I have, a GP100 and SP101. You can buy a Wolff spring pack that will contain several different weight springs for the hammer and the trigger return, as well.
If you put a lighter trigger return spring in, you should still have reliable trigger reset but lightened the trigger without compromising ignition. In my experience, the lighter trigger spring has had no ill side effects and I shoot quite a bit.
There are a few places that might need polishing, like the ball on the hammer strut, and you could fit an overtravel screw - or just superglue a small pencil eraser behind the trigger to see how you like it.
My two revolvers profited greatly from it but if you want to really know your gun and perform more in-depth improvements, get the Kuhnhausen book, I have it for my S&W revolvers.