I have many thoughts on this, but more to do with statistics.
It would be nice to implement stats modules, for at a glance analysis of members activity and points. Once such easy system to implement is HighCharts
We use them on our site, to interpret data for our users.
Another implementation I would like to see, is rss feeds and the ability to add rss feeds to a news ticker externally, one such system is the "bbc jquery news ticker" I have yet to figure it out supplying it with rss feeds, nonetheless it looks ideal for external feed applications.
As we use Q&A within our main site, we would like greater cross site interaction, and kudos for members.
This then harks back to stats and counters to add into users profiles, links and forum profiles. This we can do executing php, but really just sounding stuff out.
We have modded the Q&A now to suit our needs, will wait for next release.
Back on track, I would like to see jquery auto expandable textareas.
I would like to see, facebook integration.
I would also like to see a quiz widget, if at all possible.
Rate users, etc would be good.
Above all we need categorys. Without a doubt for us this is one of the most useful features.
The ability to parse images using gd library would be useful.
Sitemap creation and submission via admin.
sheesh the list goes on, for now its one awesome piece of software.