I know about the possibilities within CLI, but i would like to have the same possibility to have in GUI. Since if i work via GUI makes no sense to go via CLI and run a my based script to deploy it to multiple servers. As mentioned a delimiter separated list via GUI would be a good way to make possibility to work without any problems within GUI. Doesn't make sense to do one thing via GUI and rest via CLI since it only prolongs the work.
Have you looked at our CLI - "opr-assign" to perform such operation using a script or using node group.
Thanks & regards,