Have you thought of any means of initiating a recording on-the-fly? For example, if a call is in progress, make it so a Voipo user can flash over to the "second channel" and initiate a 3-way call to feature code *28 (without a phone# afterwards) or *280? Similarly (though more difficult, if even possible), flashing over to *280 to stop a recording in progress would be a nice addition.

Keep in mind, I'm thinking outside the box (and outside the programming department!), so I don't know how easy or difficult these ideas would be to work into your system...