If you're referring to the e-smith-cups package, then the answer is no, you cannot install it on SME 7. I made that package and am currently working on a forward-port to SME 7. I will announce availability of the package on the devinfo mailing list when it's done. There will also be a custom cups package to go with the forward-port of e-smith-cups which has a few small modifications from the standard centos package. For instance, it will not require xinetd.
Regards,
Robert