Superslam (Is the one thats outside of VATS i think..) is also good with these moves, I think it increases the chance for it to happen if you use one.
Do you mean to say that you can only use the Ranger Takedown in VATS?
Unfortunately, when I met Boone, he wouldn't talk to me because I was vilified by NCR, so I had to secretly murder Ranger Andy for his armor so I could initiate the dialogue with Boone. didn't realize about the Ranger Takedown perk until it was too late.
Super Slam, however, has had the most dramatic effect on combat in the game for me. Since there are only very limited number of perks you can get, I was wondering if Ranger Takedown could be a replacement for Super Slam, but it sounds like it wouldn't have the same impact.
I think I also missed my chance to get the Khan Trick because I killed Motor-Runner before I visited Red Rock Canyon. At this point, there is no way to initiate that dialogue, right?