The Microsoft "Force Editor" can be found in the downloadable link at the bottom of this page (the 'sin' one)
http://www.vourtsis.com/sindarin/DLLS/index.html
As for the hellcat, any force feedback regarding it's 12.7mm machine guns should disappear if you remove or rename the 'autocannon.ffe' and 'machinegun.ffe'. A nicer alternative is of course to edit the files instead to lower the effect a bit. The real planes back then did shake when firing, and the larger the caliber and the more the guns, with a lighter airframe, the worse it was.
However, this was more through the seat and your ass than the stick, which being mounted on a gimbal, can only transmit vertical forces (the 'up-down' motion of the vibration). I doubt it affected gunnery very much in either case, so setting it so it is not very intrusive is probably the right setting, unless limiting sound is the goal.
PS: I am building a 1:48 scale model injection kit Hellcat F6F-3. It's on my desk. Had a tragic build accident though where something fell on it while on it's landing gear, snapping both into pieces. I will try to improvise a repair somehow, despite a piece even going missing. It's my first 'real' attempt at a build since i was 11 years old or so. Bought tons of modeling tools and material. Bf 110E, Fw 190 A-8 and a F-4 Phantom II "Jolly Rogers" (Navy), all in the same scale.