Due to the current nature of our gameplay, if the locations of the ballistic and energy hardpoints aren't favorable (not high enough and/or clumped together), then the 'Mech probably chooses to carry missiles to maximize its firepower rather than play the long range game. But carrying LRMs could be iffy because you probably have to ditch taking a powerful ballistic due to the weight limit and no high mounted TAG (unless you want to carry light weight LRMs for "support") and this leaves us with SRMs.
I guess this is the general template of these kind of 'Mechs: a single heavy ballistic supported by SRMs and lasers. The long range firepower is usually rather tame because the heavy ballistic taking a lot of space and the lasers could be mounted low which limits their usage. These 'Mechs have to therefore move a lot and get closer to the enemies to maximize the delivery of their payload. Because of this reason, I propose that they get buffs to:
- mobility (JJs or speed)
- agility (acceleration and deceleration or torso twist speed)
- side torso armor for IS 'Mechs to give better protection to XL engines.
- and maybe small quirks (5-10%) to all of the weapon types just to give people incentive to carry them all.
What do you think?
PS: it's perhaps somewhat sad that this kind of (IS) 'Mech needs help but so far, I haven't found a good reason to carry all of weapon types in a 'Mech unless I have to, or, am in a Clan 'Mech!