Hi,
Just to let you know, I wrote a simple mod/wad loader (very basic, do not expect anything fancy) that allow us to pick multiple mods and choose a wad directly from the GS. No need to create an action file for each of your combo 
I’ll release this ASAP.
edit : here you go :
wget https://gist.github.com/slock83/d41293cd20810ac1e2e1f6392e5583ea/raw/24d880c67af20fe64aacd444f4120eb2a6b47d0f/zdoom_launcher.sh
chmod +x /home/cpi/zdoom_launcher.sh
echo "xterm /home/cpi/zdoom_launcher.sh" > /home/cpi/apps/Menu/20_Retro\ Games/08_ZDoom.sh
That should work 