Mine is a SA only, done at the CZ Custom shop. The Safety's are ambi and the over sized versions.
As for the light:
Answer: depends.
CCW gun, No, I do not recommend a light on them, I do recommend you carry a light with you always. There are many times you will need/want a light and you will not want to point a gun at the things you want to see.
Tactical/HD gun, Yes, light is mandatory on the gun. If you are in need of light due to a bump in the night you should have your gun out. With the light on the gun you free your off hand up to open doors ect. You also have one less thing to hold/pick up.
I do recommend a secondary light on a tactical rig, one on the gun and one again for those times you need/want light but do not need to point a gun at the thing you need light on.