@DanBayn You can access those via RhinoCommon currently if you need this for V5…
http://developer.rhino3d.com/wip/api/RhinoCommonWin/html/T_Rhino_Geometry_MeshingParameters.htm
Here is a sample script I used to test…
GetCustomMeshParameters.py (832 Bytes)
Cheers,
–Mitch