I would suggest a no on that. I think it should be a separate downloadable-by-user package. It's perfectly easy to place the same thing into either the CSSU repos or the main repository, and make it dependent on the CSSU metapackage. Same, in my opinion, should be done with the status menu applet that MohammadAG is working on for rotation control. I think both are good ideas, but some users might not want those installed, and unlike other packages/improvements that the CSSU packages, I think this is too far outside the must-be-pushed-through-CSSU realm, and fits just fine in the "could be in the repos without the CSSU" category. Using the CSSU to push intrinsic-to-necessary-packages modifications (like Hildon Desktop modifications/improvements/extras) makes sense, using it to push open source replacements for the closed source blobs makes sense too - but there doesn't seem to be any good reason to put in extra packages on top like the status menu rotation control or a transitions controlling UI within the main CSSU release itself.

(I'm also thinking that, if there are any closed source packages that can be swapped out with open source replacements without depending on the CSSU as a delivery mechanism, those should be packaged separately too - sure, most reasonable people will want to upgrade to the CSSU, especially when it hits non-testing, but they should still have the option to install the open source replacements that don't truly need the CSSU separately.

Just make sure to include a description of what they do, and the users who want/need it will find it easily.