We tested the VNC login option of the module and figured that it is barely usable. It's not working with most VNC viewers, there seems to be a small time frame the user has to connect after clicking on "Console" tab, if the wrong credentials are supplied on first connect the console tab has to be left and reopened. All in all it makes it a REALLY bad experience.
In comment #39 Paul said the following to implementing noVNC
Is there any ETA for this? It seems to be very important to make Proxmox work properly with Blesta.