Well, I can't think of anything just now, but I am sure I have turned down a few requests. But..what I do want in are these "modules" (this is repeated elsewhere too):
- download manager
- arcade section
- gallery
- banner manager
Things I like to add..but not 100% sure about are these:
- links manager
- member managment
- shop section(simplified and tied to the download section)
"member managment" is something I been thinking about a while, and it will tie together some things..like allowing members to jump in and out of groups, and transfer many members from one group to another. That sort of thing. It will also include a TP extended profile.
The shop part is something still in its infancy, and only Paypal for now - but can be handy for both sales of downloadable stuff, and even access levels on parts of the site - or rather tied to membergroups that do have access.
But more on this later on. What I do aim for is simplicty in all things. Quick and effective, the portal should not some big ferry slowing down the excellent speedboat that SMF is.

...are there specific things you are wondering about? It migh be easier for me to answer upon those rather.