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Michael De Soto
Concept features for Movable Type 4.x
New features
User profiles - With the new user roles, or permissions, or associations, or whatever it is we're calling them, why not allow a user to have different display names and different email addresses to match their respectively assigned blogs. I know I run a few websites where a pseudonym is more appropriate than my real name, and few that's it's not. I don't like having different user names.
Disable Plugins - Allow admins disable plugins per blog. For example, I don't want my "plugin action" list to be filled with links to plugins I don't use (i.e. stylecatcher). However some other blog admin might find stylecatcher useful.
Rename Assets - Allow renaming of assets.
Interface
Save state on the Entry listing page when sorting and saving entries - Nothing is worse than having to make a small change on many entries in one category and having to resort the entry list (or press back button) every time the page is reloaded.
Kill use of the word 'blog' in app language - I second Su's suggestion to remove all references to 'blog' in the application language. 'Blog' will become a colloquialism and most developers don't use Movable Type to do blogs anyway. Seeing how a blog is a specific form of internet accessible journal, Movable Type should use a more generic term. I don't have a blog, I have a Web site. Now if my friends would stop calling it a blog, I'd be a happy guy.
Template Tags
Better implementation of
MTIfCategory- Category archive templates could almost function like the pages template suggested by Tim Appnel and discussed by Arvind Satyanarayan. It's not quite the same, but addingMTIfCategory name="multiple categories", andMTElseIffunctionality (as apposed to justMTElse), would greatly reduce the need for hacks and plugins to have category archive pages look different.Pagination - There is no need to elaborate.
Add randomize as a template tag attribute - There are a couple plugins that deal with randomizing
MTEntries, but each has its own quirks. Adding this feature as an attribute could greatly improve performance. Also, this attribute should include a caching mechanism and a way to include or exclude based on tags, categories, etc. Also this include or exclude functionality should allow for multiple variables (Foo and Bar, orFoo|Bar).

