I was in these threads back when 5.0 was freshly released, the possibility of the Reservist's Rifle being re-added came up. Has that happened in subsequent updates?
Not yet
We're looking to expand the weapon options more in 5.1 (consistent with Fallout lore of course) and we can look at adding the original reservist's back.
I appreciate that, it's just a little inconvenient that the 'baseline' is most weapons dealing about 3-4x higher damage, but the multiplier is 2x. If the multiplier was upped to 4x for example, and the .44 had it's damage halved, then the result would be the same actual damage and the majority of modded-in weapons would be at about the right power level.
The other thing to consider, is that at a bear minimum you can take other weapon mods and up the damage to a comparable FWE-weapon pretty easily in FO3edit and make it FWE friendly. We didn't use any magic formulas for weapon balance, it was mostly playtesting a fine tuning. And to elaborate on Kai's comment, the rebalancing was really raising the damage for weapons on the low end of the damage spectrum. For example, the sniper rifle damage remains unchanged at 75, but the 10mm pistol goes from 7 or 8 (or 9?) up to 20 base damage. Assault rifles are in the 24-27 damage range.
At some point, I'll add a little guide to the FWE website for suggestions on how to rebalance other weapon mods to be FWE-consistent. So much to do, so little time.