Hello again!
So I was wondering if it was possible to have a unit have an ammo only dispenser or a health only dispenser instead of having them combined like the engineer does. I know that when units die they drop only ammo sometimes so there must be a way to tell a unit to carry that right?

On the side is there a way I can prevent units from dropping dispensers when they die?

The com_inf_default ODF located in the data_***\Common\odfs folder specifies which items and at what rate most units can drop upon dying. As for dispensing items other than the dual power-up item, have a look in the dispenser's ODF that the engineers use. You can see that the ordnance it uses refers to the ODF name of the dual power-up item. Simply change that name to a different power-up item. You can find the names of the rest of the stock items in the aforementioned location.