@Darek
The "done by different people" seems pretty likely IMO. I would choose brotherhood armor stats for all cybernetics brain levels, with sentry bot EMP resistance (10~15%) at max.
Also its base proto (00000079.pro) should be changed to IN 10 instead of IN 5.
Thanks. It could be argued that it takes a level for Skynet to get accustomed to the new brain, hence the lower starting intelligence. But nah, I'm with you on this.
There is a bug with the Highwayman.
When vehicle fuel ends disappears. No locations car without fuel. I drew where it occurs on the map.
http://www.mediafire.com/download/oa94n7p860cfmi1/SLOT01.rar
This is a strange one and I'm surprised no one has noticed this before (to my knowledge). It's not only the car but also the permanent special encounters that are affected. Seems like the game engine refuses to add any temporary green circles on the two lowest rows on the grid. The car doesn't really disappear, it's just the map marker that never gets added. If you click on the green triangle when you stop, you will be taken to the car out of fuel map. You can move the car to a city of choice with the fallout2 save editor in case you have screwed up a save game.
As for the special encounters, the ones that normally gets a green circle on the world map gets a red circle instead (the one used for encounter locations that don't get saved). Very strange.
I tested on an unmodded/ unpatched version of Fallout2 and it was the same there.
Not sure if it's possible to fix this properly. One solution could be to just move the car to back to NCR, that's easily doable, but it would be a bit annoying to have to go back there on foot if you are close to San Fran. Still, it's better than losing the car.
As for your slowdown issue Adolf, I tried your save and didn't notice it at all.