It would be immensely helpful for authors of highly interactive web apps if it were possible to add a CometActor to a page after the page was loaded.
See descussion: https://groups.google.com/d/msg/liftweb/JElTTog-dNE/DmsGpbhIlbIJ
Imported from Assembla: http://www.assembla.com/spaces/liftweb/tickets/933
Once #1559 goes in, I'll be able to open a PR for fiery-comets, a branch that adds support for sending down comet actors via AJAX in Lift 3.
Implemented in Lift 3!