I made this a few years ago whilst experimenting with batch files.
Put it inside your Jedi Academy\GameData folder and it'll scan it for subfolders (aka mods). These mods will be listed as options for you to choose.
Simply enter the id (the number to the left of the mod name) and hit enter and the game will be run using the mod for you.
The difference between using this launcher and using something like Boba Fett's Ultra Utility to run the game is that it'll back up your log files if you have any (that's the file called qconsole.log which is generated if you have logfile set to "1") for each individual mod.
After you're finished with the game, either hit any key to go back to the beginning and select a new mod to launch (handy if the game crashes) or close the launcher using the standard Windows exit button.
I've included a launcher for both the original JKA and for OpenJK.
THIS FILE IS NOT MADE, DISTRIBUTED, OR SUPPORTED BY ACTIVISION PUBLISHING, INC., RAVEN SOFTWARE, OR LUCASARTS ENTERTAINMENT COMPANY, LLC. ELEMENTS™ & © LUCASFILM LTD.™ & DISNEY, INC.™ AND/OR ITS LICENSORS. STAR WARS®, JEDI®, & JEDI KNIGHT® ARE REGISTERED TRADEMARKS OF LUCASFILM LTD™ AND WALT DISNEY, INC.™ STAR WARS®, JEDI®, & JEDI KNIGHT® ARE REGISTERED TRADEMARKS OF LUCASFILM LTD™ & DISNEY, INC.™