I absolutely agree that Light Fighter could use an overhaul like this, and pushing it into a more dedicated support role like this sounds good.
Just two things: One, I don't think LFs even need to sacrifice damage output for this to work. I think they are useless enough that these additional capabilities could be added without removing damage output. However, it could be pushed even more into burst, with even more powerful guns and even less powercore.
Two, the aforementioned extreme disparity within the class. I think this could be solved with gun distribution; the currently fat and bad LFs could have 5 while the good, small LFs could have 3 or even just 2.