This posting in the Adobe Reader Touch http://forums.adobe.com/thread/1168369 from March 2013 is the same issue, has Adobe made any decisions to allow sideloading deployments yet?
I checked the licensing page https://www.adobe.com/cfusion/mmform/index.cfm?name=distribution_form& pv=rdr and there is no options yet for Windows Apps, and the download page at http://get.adobe.com/reader/enterprise/ also lacks an option for Windows Apps. The Enterprise FTP ftp://ftp.adobe.com/pub/adobe/reader/ download site also appears to lack a windows app option, so I assume I've exhausted all possibilites and there is currently no way to deploy via sideloading.