According to http://ua.reonis.com/index.php?topic=1068.msg10902#msg10902 it is possible to add the "Win" button to skip fights by doing the following: When I add these lines to data/PROGRAMS/DIFF.TBL in the game folder I don't get a win button or working Alt+X when fighting. I tried adding the lines to the beginning and the end of the file.

I'm using uashell and tried to play the hacked module "As seen through the eyes of Jade".

Not having played a Gold Box game before, the navigation was awkward, but something I could adapt to. Combat against large number of enemies was tedious and I lost badly on the third combat in the game. I'd love to have the option to skip combat when I'm not having fun.

My understanding is that the diff.tbl is used by the UAShell program, which is fanware and freeware. Last version should be found here:
http://frua.rosedragon.org/pc/uashell/uashellc.zip
UAShell modifies the game files of FRUA, then you start the game.
On recent Windows versions, there have been problems:
http://ua.reonis.com/index.php?topic=3459.0

Sorry for the late reply, I only just checked the forums now. Hopefully it will still be useful to you or someone else:

When you installed UASHELL, it made a backup copy of your game and moved it to DEFAULT.DSN, and now every time you run it or apply a new design, it replaces the files in your program folder with the orignal backup and then with the hacks from the applied module's folder. So when using UASHELL, changes you make in the program folder are going to be overridden.

If you want to make changes you either have to do them in the modules' folders (e.g. modify the DIFF.TBL in the folder for "As seen through the eyes of Jade", or paste it into it, if there is no DIFF.TBL yet), which means the changes will only affect this particular module, OR reinstall UA and make the changes to your installation BEFORE installing UASHELL, so that UASHELL will make a backup of your modified installation and use that as base for all the other modules. (I'm not sure, but maybe the same could be achieved by just pasting the DIFF.TBL in the DEFAULT.DSN folder instead? Always make backup copies before you tinker with that folder though.)

Thank you, adding DIFF.TBL to the game folder (JTPart1.dsn) has added the Win button and the gods can now intervene in fights.

Adding the DIFF.TBL file to DEFAULT.DSN didn't make a difference. I haven't experimented further in enabling the win button globally.