Ok, i got it to work…
Had to edit these three files:
html/includes/hostbox-menu.inc.php
html/pages/device.inc.php
html/includes/table/devices.inc.php
Each with (added username 
):
<a href="https://10.x.x.x/gateone/?ssh=ssh://'.$_SESSION['username'].'@'.$device['hostname'].'"><i class="fa fa-lock fa-lg icon-theme" title="SSH to ' . $device['hostname'] . '"></a>
<li><a href="https://10.x.x.x/gateone/?ssh=ssh://'.$_SESSION['username'].'@'.$device['hostname'].'" target="_blank" rel="noopener"><i class="fa fa-lock fa-lg icon-theme" aria-hidden="true"></i> SSH</a></li>
<div class="col-xs-1"><a href="https://10.x.x.x/gateone/?ssh=ssh://'.$_SESSION['username'].'@' . $device['hostname'] . '"><i class="fa fa-lock fa-lg icon-theme" title="SSH to ' . $device['hostname'] . '"></i></a></div>
I was able to understand what the devices* files do but not html/includes/hostbox-menu.inc.php. Not sure where that is implemented. But i changed it anyway 
Of course this is a hacky way to do it but like @tslytsly had said, would be a cool addition.
I know there is a guacamole ticket out there too 
thanks
dave
EDIT* There is also a ticket for gateone!!