I replaced the weapon Marshal Marksmen used with the sniper that Zeal Heavy Riflemen use. This lets them penetrate armor, deal MUCH more damage, and eliminates their tracer. They're much easier top lose track of without the big glowing line that points you straight to them and do enough damage to make you REALLY wanna keep track of them.
This probably wont shakeup your gameplay much, if at all, but it'll give you a reason to stay ontop of Marshal spawns.
Massive thanks to Hoppip! He basically did all the heavy lifting here, all I did was replace some IDs in the code he wrote.