If you add some packages to the queue in Kuroo (app-portage/kuroo-0.80.2) and start the installation, you can't add another packages to the queue. Well, I don't think that this is a bug, because of if you run emerge on the commandline you can't also attach packages to the list of emerge'ing packages during emerge is already running. But in the bash I can simply press Ctrl+Z and type "fg && emerge <another package>" to let an another package install after ermerge succeed. So it would be nice if kuroo would be able to add packages to the queue during emerge is running and invoke emerge again for the later added packages after the first emerge-call finishes.
You should probably send this upstream.
Oh, sorry. I thought each package into the category app-portage is maintained by gentoo itself.
See http://kuroo.org/kuroo/ticket/230