[curt.clifton]

Another option is to create a Someday/Maybe folder in OF and set it to be not active. You can then place someday/maybe projects there. You'll still need to develop the habit of periodically reviewing them, as Brian points out.

I currently use two levels of Someday/Maybe. I use On Hold for projects that are "Someday Soon", and Someday/Maybe folders for more "out there" ideas. I'm not sure the latter is an improvement over OmniOutliner for this purpose. Somehow I felt more free to brainstorm when my Someday/Maybe items were in a separate application. Though that may just be the weight of knowing (thanks to OF) just how much I've already committed to.