The ToSDS tool has the following options:
Use Default Resolutions - Check this to use default number of faces.
U - Number of faces in the U direction. Can be set if Use Default Resolution is unchecked.
V - Number of faces in the V direction. Can be set if Use Default Resolution is unchecked.
Subdivision Object - Check this to make Subdivision object instead of triset.
Merge - Check this to merge all converted objects into a single Subdivision object.
Join - Check this to join faces that have edges near enough.
Distance - Maximum edge distance for joining faces.
Del orig. - Check this to delete the originally selected objects after conversion.