It would be neat to be able to select alternative weapons for every class, similar to what Project Reality has. Although most of the time, PR's weapon selection just involves optic choice - aim point/red dot sight or magnified optics.
In Forgotten Hope, Scout could get M1 Garand/M1 Carbine or M1 Garand/Springfield 1903, Riflemen could get choice of rifles just the same, etc.
For each class that would be great, just more of a selection of loadout is all. Maybe you want to be an engineer but you'd rather have an M1 Garand instead of the M1 Carbine. Your accessories should not necessarily dictate what primary rifle you have.