With some coding from More Dozers (+2) and More fucking Marshal.
This mod allows game to spawn more special than usual.

List what I changed:
shield=20
medic=16
taser=8
dozer=12
cloaker=8
*Note: Those numbers are added after the default spawn limit

As for Marshal since it's didn't use spawn limit so what I changed is.
-There no cooldown at the start of mission
-There is 2 group and each of group come with 5 marshal
-and have 2 mins cooldown to respawn

Lastly, as special spawn limit has been hugely increased I also edited the spawn group to allow special spawn in double amounts instead of the regular ones (in order to make it fill to its limit faster).

any incompatibility?
Any mods related to changing spawn group and More fucking Marshals are likely to conflict with this.

The mods feature might not go perfectly as I said above but you are free to help and fix any issue if they have.

showcase:

install in Mods folder.