Thank you for the feedback. We are currently working on making the sub-domains registration available from the Sitefinity / Telerik accounts.
Regarding the pdf documents, that need to be signed for the domain aliases, I have forwarded the request to the respective people and I'll let you know if it is possible to change the procedure.
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items