Does anyone know if it is possible to create new dashboards with standard licensing?
I am not sure because we use Enterprise licensing, honestly I wouldn't see why you couldn't create new dashboards with a Standard license though.
I don't think you can with Standard licensing. We only have Standard and it is really frustrating, but we can't justify the switch to Advanced as it is not our primary monitoring tool.
There is a bit of a hack-y workaround in that if you get a trial of Advanced or Enterprise you can then create additional Dashboards that will still be present when the trial expires and reverts to Standard.