At close range they suffer penalties on to hit as per the write up on them, but to compensate they should get bonuses for every 100 meters past 180 meter minimum range. They also should increase in speed from the time they are fired till the time they hit in order to keep them in line with ballistics. They get a buff to indirect fire and a nerf to direct fire because they are launched at a 90 degree angle. This way you differentiate LRMs from ATM, MRM, SRM, and SSRM. Out of all the missile types in BT, the LRM is the only indirect fire one.