Go for it. This is all the actual text from my PC Equipment file, since the Melt Cannon was actually part of a series (designed to fit in with Plasma and Laser):
BeamGun 8
Name <Melt Gun>
desc <This short-ranged beam weapon is known to eat away armor.>
Type <BRUTAL SCATTER>
Range 4
Acc 1
Speed 2
BeamGun 10
Name <Combi-Melter>
desc <This rifle is actually two Melt Guns designed to work together.>
Type <BRUTAL SCATTER>
Range 5
Acc 1
Speed 2
BV 1
BeamGun 20
Name <Melt Cannon>
desc <This heavy weapon is known to chew away even mecha-scale armor.>
Type <BRUTAL SCATTER>
Range 7
Speed 3
BV 4
I added the these weapons in because large sewer-cleaning missions, cave exploring and militia fights seem to take too long with just the standard beam weapons, and managing ammunition is kinda annoying since lancemates don't autoreload. I also kinda felt that the personal-scale beam guns were vastly outnumbered by their mecha counterparts.
