Sorry, if my remarks bothered you. I just assumed you had not looked for this feature.
Do you know about the project "notes" feature, I know it does not solve your issue. But, I was thinking that adding a workspace "notes" could solve your "todo" issue. Not, sure if it would be proper solution for "readme" issue.
Even better would be if the workspace could be treated as one big project(with sub-projects) with global build options and such.(great for scons build scipts)
-Mad
Do you know about virtual targets for projects? It sorta does what you said but just for a single project.
Tim S