Well, there is nothing in the member's terms of service that prohibit the use of scripting, macros, or other forms of character automation, so presumably (since other players are doing it with Windows-only macro products) it's allowed. They even teach classes in-game on how to use macros. =P
I fail to see how using Perl to automate a Windows app would violate the Artistic License - could you tell me where you see a problem with that? I'm curious!
There have been all sorts of Win32::OLE automation modules already, including ones to automate Excel, Outlook, and Word - I guess I just don't see how this would be any different. Is it because it's an online application?
LWP does the same thing with web sites, and they're online...