[PlasmaKrab]

!!!Warning!!!

From my own experience, range=O implies game crash. Test it if you want, I may have had other issues when I tested that, but as soon as I fired a range=0 weapon, it all went fuzzy and back to desktop.

Better make that range=1, after all engineers are able to demine the next hex just as well. Make them area-fire into an adjacent hex and they will place their mines. More to the point, if you set them to fire (lay mines) into their own hex (provided you can) they have chances of 1) suppressing and pinning themselves, 2) not getting out of the hex with all their feet attached and 3) start demining their own mines.

The trick to attach a mine-spreading weapon to any unit, if you need to know, is the following: take an innocent unit, strip it off of its weapon and tweak as you like, then assign all its four weapon emplacement to the same, unoccupied slot in the weapon list.
Then leave that unit alone. Next step, go to the weapon page, copy to buffer any old FASCAM weapon, paste it to the very same empty slot you assigned to your unit and tweak as needed (range particularly). Do not try to change class. Save your OOB. Do not reverse these steps.
Important: DO NOT attempt to change the unit's data after you've created and assigned the mine weapon, otherwise you'll get stuck into this unit, the program will go on checking weapon/class incompatibility and you'll have to do it all over again.

In the first step you may want to change your unit's class to something inoccuous so as not to have the IA picking it and to separate it clearly from the rest.
This procedure should work with all kinds of units. THe trick is not to let the editor check the unit once the harm
is done.

That's a tricky workaround but broadly that's the only way to go (details may vary).