I'm working on having the display use templates right now with 5.0 and I haven't started any new features. I wont do that untill after it's templated. Will make it easier if I have less to convert up front.
I may how ever, give creating an archival system a try this week so sites can move older posts they want to keep into a mirrored w3t_Posts table. Some of the speed problems with the index is the fact that some sites have a huge post table to have to search.
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