i have no clue, since this person doesn't mention what their domain or webid is, or exactly what they're trying to do.
you can point a domain registered through us to other nameservers very easily from the web admin panel (without any help from us).
as far as pointing the domain to an outside server through our nameservers, that's not something we generally do (nor is it our responsibility), although i'm sure we probably would if asked nicely.
i can't comment on this (and i doubt anyone else from DH will either), since we don't know enough about the situation to make any sort of comment. the support team would really be the proper channel to resolve this situation.