Just a ruleset suggestion I think would be useful: give the ability to limit the number of uses (like the medi-kit has) to other items as well. Medi-kits can be used 10 times only per mission and then it's useless until next mission. I think the same functionality could be useful for other items. I want to use it for the psi-amp (make it one time use) and I'm sure there are custom items in mods that could make use of this functionality as well.
Just another tool in the battle to balance psi. If you mod psi amps to be heavy, difficult to manufacture and one time use and you have to use psi very strategically.
Related suggestions:
2) Allow maxRange value in item ruleset to be applicable to mind probes and psi amps as well. This already is in OXCE and I think it's a nice feature (costing stun/HP/morale/energy is useful too) and I assume it's not major to add the option, but I might be naive. LOS already does this indirectly, but maxRange would allow to use it through walls and make even more limited range if desired.
3) If transferring between bases, stay in psi training if there is a psi lab at the new base with an open spot.
PS - If any of these suggestions are already doable now, I apologize and if someone could explain to me I'd appreciate it. I tested with requiring psi amp amo and clipSize 1, and maxRange but it didn't work as intended. I've been playing the nightlies as well as OXC extended, but I don't think the first or third suggestion can currently be done in either.