Mmmh, Chieftess, I don't know much about the beta process, but I heard some testers will post their games or thoughts or whatever of the beta...
A UU that can't trigger a Golden Age just plain sucks. That's why it's difficult to come with one good UU replacement for a scout. Can 0/1 or 1/0 exist in Civ3 ? If so, why not :
chasqui scout
1/0/2
ignore movement penalty due to terrain
10 shields
It would allow a golden age after YOUR decision, it will scout a little faster in rugged terrain or dense vegetation, it won't cost more than a normal scout, but it can be captured (say they aren't prepared to defend against a foe but can attack on their turn because it's an exploration unit (offensive)).
If people want to keep it as it is, what I really ask (too late

) is to be able to build either the UU or the standard unit in any case.
Oh, I forgot to say the chasqui will probably upgrade to... explorators ?...
EDIT : And I would allow
my chasqui scout to be the unit the Incans get in 4000BC, because it seems now that they start with a standard scout ?

They messed up this thing...