Yes you and your role as medics is important, however having more slots than other regiments just because of your role is not fair and isn't as beneficial as you would think.
(example) Now you may say your MT are active, but if only 2 medics are on during an event, they aren't really 'active'. Instead of getting more slots to recruit more medics which then may not even come on a lot, be wise when recruiting new members to MT. Make sure you are picking people who are active and also good at roleplaying. Activity is the main factor you want to be looking for, they can always be taught how