CenterAtOrigin : http://moi3d.com/forum/get_attachment.php?webtag=MOI&hash=c8dbd286b15a090e946944a45011abbd&filename=CenterAtOrigin.js
PutOnGround : http://moi3d.com/forum/get_attachment.php?webtag=MOI&hash=ea7565950b77334486adb9fc11310d1b&filename=PutOnGround.js

Put the files in the commands folder
All after press Tab and write the command, or by Shortcut