I assume you have the normal 3.2r or 3.2r2 share version.
I also assume that you desire functionality in share that is not really associated with rules, but more associated with the functionality that the alfresco web client has (actions for example).
Assuming this, you would be best adviced to wait for the alfresco & share 3.3 version. That is, to my best knowledge.
In essence, the "old" share version lacks rules in the document library. The "new" 3.3 version does not incorporate rules either, but is certainly more complete with respect to functionality similar to the alfresco web client.
In general, you should not want to manage rules by means of share, since those rules determine actions in your backbone (alfresco).
You can (fairly easily) introduce rules, working behind the document library of share, when adding the desired rules to your alfresco backbone. Just go to alfresco, to Sites and add (and test) the rules to a test site.
Then, in order to have share (when creating new sites) add the rules persistently to document libraries (of various sites), no tweaking of code should be necessary.
It should be sufficient to add the rules from the test site to the Sites map in the alfresco backbone AND when creating the rules, just choosing the option (in the rule wizard, step 3) "apply to sub spaces".
You then have an identical set of rules applied to each of your share sites.
In summary, the new 3.3 share version has additional functionality (if you are looking for alfresco similar functionality) and the alfresco backbone can be used to apply rules to all share sites.
Hope this helps.