[Fyron]

Geo, make the special multi-sector storms be a different size than Medium (which is the size of all default storms). Change all the normal storm sizes in SystemTypes.txt from Any to Medium. Then
to make a multi-sector storm, you have 4 sizes you can call upon. Have 1 entry for a Tiny, a Small, a Large and a Huge storm in SectType.txt. You can use 4 tiles (one for each size) to design the multi-sector storm in SystemTypes.txt. You can then tell the storms to be a different storm type than Normal Storm. Make 4 entires, for each of the tiles in StellarAbilityTypes.txt. You can give rach part whatever ability you want it to have, with a 1000 chance to occur. Or, you could get rid of the normal single sector storms, and have 5 tiles to use for multi-sector storms.