This is the relevant code from the demo:
I can't see the way that this might get done with WebOSMaps markers. Is it possible?
Alternatively you can try using TMS VCL WebGMaps or TMS FNC Maps instead.
Is it possible to have the label moveable?
Unfortunately moveable labels are currenlty not supported.
We would have to investigate if this is supported in the API and if it can be implemented in a future version.
Is it possible to use the Marker without an icon, so that only the MapLabel is used?
A marker always has an icon or a custom image.
You could use an empty image as a workaround here.