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The AA in M3D is simply done using the Viewing arrows (1:1, 1:2, etc...) at the top of the main window. When you save as PNG or JPG, the downsized image is saved (WYSIWYG). It's as simple as that.

I Render Large, save @1:1 in Png and do edge treatments by hand as Postwork in Photoshop before Resample/Resize and save for Web as Jpg. A true rendered  antialias would be good but not sure it's worth the extreme added render time, I like putting the personal touch on an image after the machine is done making it.

Yes bigger values will blur
but the low value we indicated will not only minimize jagging but also give the sensation of more sharpness (because more clean edges)

And after all that as last touch to give even more sharpness is always possible apply Unsharp mask (that even if the name suggest the contrary is for sharpening )

NB perfectionist will apply unsharp mask only on the L channel in Lab color space to avoid any color shift

But to this there is a alternative that may sound more simple :
1 duplicate the layer and apply unsharp mask on the duplicate
2 change duplicate layer mode in Value (for gimp ) or Luminosity or Lightness (PS )
3 save the visible

I am wrong or render at 1:2 or 1:3 took exactly  the same time that render at full size ?

I do agree that in that case M3D does a pretty good job but ,maybe because i am used to bitmap editing and for me that is really quick to do manually (less then a minute for render) i prefer render big and downscale manually

(may be different for animations i did not try yet