CRT=1 or 2 guidance requested

[Whacker]

I'll prefix this by stating I am NOT looking to cheat or any retardedness along those lines.

I primarily play offline (DBW and some stock 4.11.1), but am thinking about playing online a bit. The main gist of what I'm looking for guidance on is, how much can I modify the game's interface and still be able to play on CRT=2 servers?

For example, I'd like to be able to use the latest SAS Modact with just the two FOV mods and maybe some textures, and play on stock 4.10.1 or HSFX 5.01 servers. I don't want to modify any of the game mechanics, like flight models, damage, or anything along those lines. I just want it to be a bit easier to interact with. I'm aware of and have used San's FOV changer, but I prefer the two FOV mods much more.

So, in general, what do I need to avoid doing to not have any CRT=2 errors, or things viewed as "cheating"?