Another way round the 6 group limit is to choose 1 group, assign group number 7 to it, thus making it a default load.
Then all you need to do is just specify the weapons for that group in the loadout for the type of mission they are applicable to.
You will not be able to select these weapons manually, but the game will load these automatically as specified in the loadout.ini
This way you get 1 free group to assing to another weapon station and load it manually. I think this is great trick for getting assymetrical loadouts.
I'd say, a good choice for a Tornado would be to number the wing outer stations group#7 and group#8 (by default they are #1 and #2), thus you will have 2 free groups to work with. You can place the BOZ107 and Skyshadow pods as default weaponry for each type of mission in the loadout.ini. So the game will automatically load these pods in every type of mission. If these are not used for some type of mission, just remove the entries from the loadout.ini for that type of mission.
I am very fond of using this trick and in fact on a Su-22M-4, I have entered as many as 11 station group numbers, 6 manually loadable and 5 only automatically loadable.
Hope that helps.