One
Warhammer variant is equipped with a LRM-20.
You can guide the MRM with your crosshair, like SRM with no lock. With a bit practise (one salvo should be enough practise...) its not such a big deal to achieve hits with it.
BTW: I miss a
Bushwacker with a MRM-40 mounted on the left arm.

And i would give my first-born for a
Thanatos A with MRM instead of SRM...
EDIT: And please no MRMs at all for the Clan-scum. They don't like the whole idea of MRM (referring to the BTU) and they do not deserve them in MWLL.
(Hey, everywhere I only find pro-clan-posts. And who takes care of your origins, the Inner Sphere?!? IS is the only right choice! Hah! Clanners are traitors with a twisted mind! -except the Novas-)