Here is a thread on a similar topic.
Do you mean you have only Button #5 on the base, or five buttons on the base? My retired gameport Sidewinder Force Feedback Pro has five on the base, but one is a shift button, essentially doubling the number of buttons to 16.
My current Sidewinder FF2 has four on the stick and four on the base.
- On the stick, I have Primary Fire, Secondary Fire, Countermeasures, and Target Next Live Turret.
- On the base, I have Afterburner, Cycle Primary, Cycle Secondary, and Equalize Shields.
- The hat is mapped to more targeting functions - Next Hostile Bomb or Bomber, next Subsystem, Ship in Reticle, and Next Ship on Escort List.
It seems like I am always playing around with them, though, and sometimes I will have totally different mapping for certain mods, especially if they use Glide or directional thrusters.