Any alternative to vino, x11vnc, and x0vncserver?

I like to use vnc to connect to an existing session/display on my ubuntu machine, either actual or virtual (like created with Xvfb). I need to set it up through terminal and ssh, i.e. I do not have access to the machine.

I have explored 3 options but each lack a feature I need.

1. vino:

   Works fine, but it does not seem possible to only send a portion of the display with something like a -Geometry option.

2. x11vnc:

   Works fine, but the -repeat bug is a bummer. It is explained under -repeat option here.

3. x0vncserver:

   Works very well and I thought this is the one I have been looking for. However, the clipboard does not get synced between host and server as mentioned here.

So, are there any other options? I do not want to use TeamViewer of NoMachine and I like to have gnome ubuntu dekstop.