You couldn't run this party in vanilla BG 1, since Minsc and Edwin conflict and will end up fighting each other IIRC.
Also, I think Minsc leaves the group if Dynaheir dies, so you can't have one without the other long term in BG 1.
BG1 Tweaks has the same component at BG2 Tweaks (NPC's Don't Fight) so you can run them in vanilla. I don't know if they updated the readme for BG2 Tweaks to show it's a separate component, but I made sure it was in BG1 Tweaks. The only member not affected by this component is Ajantis, because when he attacks an evil party member, neither leave the party and you can get them back under control.
As for Minsc, he will remain in party after Dynaheir dies so long as you keep a high enough reputation and don't kick him out.
@ Crowseye - The "Happy Patch" component can also negate the effect of reputation on all party members, so the good will stay with low rep while the bad stay with high.