I know Storm Haven allows it and I believe PEQ does as well. There may be a few others out there, but not aware of any with #zone enabled offhand.
It should be the same as the RoF(1) client as far as which zones are missing. The playguide has some information about that. Basically you would want to copy the same files over to RoF/RoF2 as you would fro Underfoot. The reason is because they revamped a lot of zones and removed the old zones' files from the client download. But, if you just put those old zones back in your folder (by copying from an older client such as Titanium), you can access them again fine.
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