F9 toggles through the laser recharge settings, F10 for shields, and the SHIFT of those keys will divert power each way (SHIFT+F9 for shields to lasers, SHIFT+F10 for lasers to shields ) Your throttle settings are + to increase throttle, - to decrease throttle, \ to set throttle to zero power, [ for 1/3 power, ] for 2/3 power, and BACKSPACE for full power.
Unfortunately, I've never used a joystick with a throttle, so I wouldn't know how to set that up in the DOS version of the game.
BTW, there was a utility called XREMAP that added some keyboard macros, most importantly ~ to dump all laser energy to shields and rebalance shields. You can find that utility at the "Flight Deck" of the CRS Morning Star site (see my signature).
Also, if you can find a copy of the manual from a later game in the series (such as XvT or XWA), many of the keys to do things remained the same, so check there. (Darksaber's X-Wing Station (
http://www.darksaber.gaylenol.com) has a PDF copy of the XWA manual, if you can't find one.) :)