In case others find the suggestion useful, I'll mention that I have found it sufficient to use permalinks in email for page revisions on my wiki that have long titles, rather than arrange to get this extension installed.
For example, it's nice that the Hindi-language page about the Hindi Wikipedia is at <http://hi.wikipedia.org/s/164>. However, if that were not the case, it would still be nearly as useful that its present revision can be accessed via <http://hi.wikipedia.org/w/?oldid=1902067>. (I don't know any Hindi at all. I only knew that this extension is installed on that language version of Wikipedia.)
I am not placing this suggestion on the extension's page. When I mentioned it a short while ago in IRC #mediawiki, I found that it might not meet with consensus.