Hi
We also did it in the past, but NOW switch has NO tool to handle that. :-( I've been told last week, that the bulk-update-tool in fact is planned for 2006. We had to manually update loooads of domains manually last week.
I've also noticed that the whois service is rate-limited now. Even only a few successive whois-requests will lock you out for an indefinite amout of time. Whitelisting an IP is not possible, according to their helpdesk. The only solution is to use the "whois-is"-service, which only gives information on the availability of a domain. Oh well, I guess all the new features need some getting used to. You need to give them some credit for the new website, though, I think it looks very pretty.
Daniel