I'm interested in this ;) I always have two spaces between sentences, as taught when I did secretarial training on an old fashioned manual typewriter.
However, I appreciate, when on line or in a forum etc, there are instances when the extra space takes up extra space that is a premium so sometimes I do leave only one space between sentences.
My experience, mostly with non-secretarial trained persons, is that techie folks will insist on only one space. Personally, I prefer to read text that has two spaces between sentences and two line spaces between paragraphs.
Old habits can be hard to break! ;)
As for any solution, I will follow this post with interest. :)