Hi all, and thanks for comments.
One point note: I was not supposing the meshes as "parameter over 7". There was some more prims before meshes introduction, handly editable by third party viewers as Emerald, Phoenix. For example: Line->Half-Circle, Circle->Hal-Circle eccetera... I did a project (a linked project) with these prims but unfortunately I discovered late at the end, that I cannot edit them by script. This means pull away a lot of done work... I did this project with the target to avoid lag (generated by sculpted prims) having good compromise of 3D aspect.