Yeah, SA 4 and Max-Tac is a bit early, but under IU, you can have both CS and Auth, so...it's fresh meat! Also, she's hot, so she has a much higher chance of getting what she wants...despite being also cold and aloof..I guess.
@eraser7278, ah, you ask all the hard questions. I'm trying to avoid all non-Core Roles and the attendant confusion/complications. I know, you're thinking, "But, Sard, &*$^%@ Combat Sense means stealth is now stupidly underpowered!" and you're right. The solution is to have a base difficulty boost to stealth, depending on environment.
So, for example, hiding behind a chair in clear light is pretty much no modifier. No chair/cover and the enemy gets a bonus to spot you.
Other than that, darkness would be +5 to your stealth check, darkness and rain would be +8 or so, darkness, rain and wind might be +12 or more...like that. Still need something to defeat thermals, of course.
Hide/Evade is mostly about Evade, the ability to dump a tail or follower. This includes in a vehicle or in a crowd..without necessarily sneaking and attracting notice from passersby as you crouch behind a bin or creep into an alcove. Not to mention Stealth doesn't work with vehicles.
The Hide part of Hide/Evade is pretty much interchangeable with Stealth. As a GM, if you are sneaking up on someone or hiding from someone actively, I don't care which skill you use.
On the subject of doubled up or redundant skills, I usually allow whichever skill you have to work. Dodge/Escape or Martial Arts Dodge both work to dodge a car flying at you. Rifle and SMG are interchangeable for automatic-firing carbine scale or somewhat larger. Not Heavy Weapons or Bolt-action, obviously. Machine-pistols work on either Pistol or SMG. That sort of thing.
Skills are really just representative of your character's learning and experience. If you can make a case that a skill lets you do something, great.
@kanonite, you obviously know the system. You might want to actually stat up a character. I do allow rebuilding characters for the first few sessions (weeks in PbP) as people get used to the setting and system.
In terms of system, my rough plan right now is to use IU to replace all the "stupid" parts of the Corebook, while still keeping things as simple as possible for newcomers.