Yeah, if i was starting from scratch, there are a few legacy conversion rules I would change.
Drop the minimum 1 damage needed for AC, LRM, SRM.
Change base damage to round normal, not round up (so it matches special ability damage).
Both of those are no longer necessary because of 1) combining all the special ability damage into base and 2) the miminum damge rule (aka 0*).
Dropping heat from special ability damage can be problematic when a unit has multiple special ability damages. If you have lots of LRMs and SRMs, you can have a total LRM/SRM over the base if you ignore heat. And you can't ignore heat entirely because you shouldn't have special ability damages higher than base. A Longbow with nothing but LRMs shouldn't be able to ignore heat. But i think dropping the minimum and make base and special both use the same rounding would do something similar.
And I'd love to have more special ability damages (pulse, ultra, etc) not just special munitions. Honestly, special munitions are broken. Standard ACs, LRMs and SRMs are better than ultras, lbxs, lrm with artemis, etc because of special munitions. And are better than most PPCs, pulse lasers, large lasers, etc. (ER Smalls and Medium Lasers have their own OP issues).
But we're not looking to invalidate all the existing unit cards any time soon.
