Typically Connect.Microsoft.com is the best place to go for those kinds of things, or you can submit feedback on the SharePoint Team's blog
(http://sharepoint.microsoft.com/blog/Pages/default.aspx). I don't know that there is a public space on Connect right now for SharePoint, but you may be able to submit a comment about it
regardless.
The thing to remember is that they've already started the Technical Adoption Program (TAP) for SharePoint as a part of Wave 15, so they have a pretty good handle on what features and functionality will be going into the next release of the product. I'm not
trying to discourage you from providing your feedback, but just want to let you know that given where they are right now with the next version of SharePoint it may be a while before they can incorporate it into the product.
John
MCITP and MCTS: SharePoint, Virtualization, Project Server 2007
My books on Amazon: The SharePoint 2010 Disaster Recovery Guide and
The SharePoint 2007 Disaster Recovery Guide.
My blog: My Central Admin.