I found out that there's a way to get permanent haste in v3. I assume it's a bug. It's probably something similar to the ISRUN situation. Don't know if it works in other versions. And with that said...
I wouldn't blame someone if they didn't consider this a legitimate win, but it's good enough for me. I don't want to play any more Rogue.
Permahaste aside, I had extremely good luck in that run. I found the only two handed sword I've ever seen in v3 and the only scroll of genocide I've seen in any version. I used it on umber hulks, of course. I also had really nice armor that was at one point enchanted all the way to AC -1 (the equivalent of AC 11 in v5).
I had beaten a xorn in a fight before I was able to trigger permanent haste (I had triggered it in one prior game), and I considered not doing it because that character might have been strong enough to win without it, but in the end I decided to play it safe.
I don't know if I'd recommend playing v3 for a lower difficulty. The absence of the ISRUN bug makes a huge difference, but v3 doesn't have some of the useful items in later versions, and umber hulks/medusas are even more hardcore than they are in v4 and v5. Two handed swords seem much more rare as well. Most importantly, it's just not as fun or polished as later versions.