Separate Medical Gameplay from Support Class
The Support Class is proficient in Light Machine Guns (LMGs) the purpose of a LMG is to suppress by laying a whole Lotta lead down range, to keep the enemies heads down, while your team pushes. Or.. Spray and pray while clearing rooms (not recommended).
But none the less, the Support role in itself serves a important role suppressing and providing ammo / cover. The whole medical aspec deducts from its role as a Support "gunner". My solution(s)
1, Add a specialist perk which allows players to choose the Support role as a Gunner (LMG + Ammo) or Medical (Assault Rifle / Carbine + Medic)
2, Create a new Class, Similar to the old Battlefield titles (Medic)
3, add the Medic role to Assualt.
While 1 and 2 are more appealing. 3 wouldn't hurt.
Thus it wouldn't have a significantly negative impact on the game, and would offer more roles and require further teamwork among players. As we all know, alot of people play the Support role for the LMG, but dont participate in the medical gameplay.