I think that a way to make LRMs more interesting without turning the game in a LRM camping fest again could be to give them an alternate fire mode, the current mode would be retained.
What about an indirect map-assisted fire mode. The pilot would select a location on the MAP and then dumb fire the LRMs, the missiles would rain in the area around the selected point flying a very high trajectory, the impact would be rain-like. Controls to trim the desired spread would be great too, for example the area could be selectable between 10 and 50 meters radius, density would be decreasing from the center, giving missiles a little more splash damage would help make the weapon more "saturating".
This mode would not require line of sight but damage would be moderate/low, enough to discourage camping behind a rock. Imagine using such a system together with a C3 mech transmitting the position of candidate targets.