Very good questions Gypsy Baron. I don't see anything when I put the cursor on the primer pump. Could be that tooltips thing you're talking about. My mouse wheel works for everything outside of FSX...just not in it. In any case, I used the provided utility for B-17 key mapping and have assigned keys to operate the the engine selection and pump action of the primer and I'm happy to report that I made it through my first fully manual engine start. (very satisfying too, by the way!) Previous to this I've always had to run the auto start sequence, and let's face it, who buys accusim planes only to then run everything on auto??? Not me! I'm a former C-130 Flight Engineer and I love to tinker with the systems. LOL Thanks to everyone that posted a response. You guys are all awesome and you've helped me greatly. Cheers!!!
I flew my AccuSim B-17 for a short jaunt earlier today. I had read your post, but could offer no help until now.. I do the following without thinking, so it might be of some help for your situation..
My "start routine" is simple, start the APU, once power is "up and running", turn on all three battery switches, and start the hydraulic pump. I double check that the "Main Power" switch (on the center console) is on as are the Mag Switches. I switch to the Co-Pilot's seat, flip on the Fuel Boost Pump Switches to #3 and #1 Engines (#3 runs the Priming Pump, I start the engines as per my Dad's USAAF Manual 1-2-3-4). I move my cursor over the priming pump and "automatically" (the without thinking part), I Left Click on the center of the Priming Handle.. This brings-up the "tool tips" that tells you which engine the Priming Pump is set-on.. It is generally always on "None". I use the Scroller Wheel" to "twist" the handle to Engine #1 and left click to get it to "pump".. Do note, the "point" of the cursor has to "touch" the exact center of the priming handle before you left click the mouse.. then it works..
Another "oddity" I found.. I have to "left click" on the Flux Gate Compass' setting knob before I can use the scroller wheel to adjust the heading.. Same with the radios (they take forever to dial-up!)
I did not "program" my Mouse to perform any cockpit tasks, it "just does".
I'm still running XP (Pro SP3) and FSX Deluxe with the Acceleration Pack (includes SP1&2).. I don't know if that makes any difference, or not..
Give it a try.. this might work for you, as well..