When I say markings based on squadron, I'm talking about actual WWII squadrons, not AH squadrons. This is not about having custom markings. Skins are not submitted for a person or squadron's private use. Forget the word "custom", that's not what this is. What it is is the ability of a player to add another skin option to a particular plane that EVERYBODY can use. The purpose of submitting a skin is for everybody to use it. If that is not why someone is submitting a skin, then they shouldn't submit one. Period.
As I said, there is a criteria that must be met for us to admit a user submission. Basically, it must be something that we would add to the game ourselves. A skin may not be added for many reasons- quality, historical accuracy, redundancy, adherance to standards, usefulness, sensibility, and representation(i.e. a pink polka-dotted B-24 might be historically accurate as one did exist, but it is not representative of B-24s as it is a unique eccentric specimen nor is it useful and would not be a paint scheme that we would use). We'll talk about all of that when we get there.
The real feature here is that each plane can have a selection of skins that a player can use. The ability of a player to make and submit skins for online use is not the feature, it is the mechanism by which the real feature can be usefully implemented(I'm talking from our point of view, it is very much a feature to the skin making enthusiast, but realistically it's probably generous to say that 1 in 100 players fit that description). If we had unlimited art resources, the latter part would be unneccessary. But that is not the case and while we would like to have multiple skins for each plane, our resources are best spent in adding new models and improving existing ones rather than adding more skins. This is the means to facilitate a win-win situation between everyone who wants more skins and those who want to make them.