There aren’t new builds enabled by et tu, but if you quickly describe the archetype of the 4-5 you have in mind, you may be surprised that more are not just possible - but fun and feasible.
I know like 5 builds
Sniper, brawler, stupid, junkie, energy weapons
Also Gifted is OP trait, while some other traits are useless
1) what other builds are there?
2) any mods that expand build variety?
3) any mods that balance traits?
Imo build variety is is the main problem with FO1, an otherwise near perfect RPG