What is Aurora ?.... What are the grids supporting such variable region size ?... Isn't it a dead project anyway (I heard about such a feature a long time ago, but IIRC, it was abandoned by OpenSIM developers) ?
AFAIK, Astra = Singularity "future" branch...
Please, post grid list change requests in
this thread, giving the parameters necessary to connect to the grid you want to see listed. However, I would only add such a grid if the viewer is compatible with it...