I've been playing such a character myself lately, using only Chinese Jumpsuit or the Chinese Stealth Armor (with FWE it doesn't have the Stealth field). I've also adjusted the game settings and damage multipliers so that getting shot means getting seriously injured, if not outright killed. With increased spawns and 5x feral ghoul rampage this has created many "interesting" situtations :cold:
As such staying hidden is paramount, meaning that i must kill enemies either by sniping from far enough that they don't hear the gunshots, or using silenced weapons, still preferrably from a dark place far away. Melee Weapons would propably work too, assuming you can kill the enemy with one hit and don't use Responsive Kill Reactions. Stealth Boys i have not used much either, mostly in situations when i go trough a door and land in close proximity of enemies.
Using WMK with FWE allows silencing and scoping a lot more weapons than what are available otherwise, also get ahold of the Victory Rifle ASAP, also http://www.fallout3nexus.com/downloads/file.php?id=11611 i have found invaluable. By default enemies don't react to one-shot kills, so you can use that to your advantage, or if you want to make the game more interesting, use this: http://www.fallout3nexus.com/downloads/file.php?id=11750, that has gotten me killed many, many times.
For Behemots and Gargantuans (if you use MMM), i set a "Mini-Nuke IED" and lure them to step on it, in FWE mini-nukes and missiles explode if they are damaged, so drop a mine and a mini-nuke next to it... :nuke: That doesn't kill them, but damages them some and usually cripless their leg(s), meaning you have an easy time of finishing them off or running away.
I've died more times than i care to count though, playing dead is dead would have resulted in my computer flying trough the window a long time ago