I personally disagree with the idea of making the role generalist.
Afterall they are team leaders, they shouldn’t be bouncing around as realistically they’d be taking a whole team with them wherever they go. I think if anything, give them the orders ability but downgrade it from the SL/SO versions, less time of effect, greater cooldown. Make it so that they can use injectors, maybe pill bottles, but def not defibbing, so that they can support medics rather than being medics themselves. If you have a role that can do all of the stuff a medic can and all of the stuff an engie can, then why go medic or engie?
Previously RTO (now TL) had SL medical skill and it was… OK? We removed it because people were taking the role to minimedic rather than lead/JTAC (which is still your primary goals as TL). I have considered adding an extra rank of medical skill that allows usage of medevac beds and not instant injectors/etc that TLs would get to really home in on them being able to support via company level assets.