ModelConverterX scale size

Yep - there is a transformation Icon and it has a scale feature as well as move and rotate.

EDIT: Right under the Wizards Pulldown Magic Wand

Edit: use Trespassers solution.

Here.

Make sure you save your original objet, because there's no reset to default : if you change the scale by 0.9, it is permanent and the only way back is to change the scale by 1.1

Note:

Changing scale in object placement doesn't work for AFS2 AFAIK (works for FS/P3D only) and is a global factor => works simultaneously on X, Y and Z.

The Scale object feature above is effective on the currently open object in MCX and you can adjust each axis separately. Very efficient when converting old FS9 stuff for accurate placement on photo sceneries...

Cheers

Antoine