That assembly is also in the Sitefinity bin directory. We needed it during compilation, but since it's already in the Sitefinity bin, it is really not needed by the server. That's an omission :) We'll remove it from the distribution for the next version.
Thanks for noticing!
p.s. do you need bonus points? :)
the Telerik team
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