I'm not at my desktop computer at the moment, so cannot check this, but my strong impression is that ANY font installed on your computer is available to 3D Maker.
We need to know which program you are accessing 3D Maker from.
If you are using the 3D Maker templates from within a program such as Photostory, Movie Edit Pro or Video Pro X the Fonts etc are not editable.
To be able to edit the fonts, styles, effects etc you would need the full version of Xara 3D Maker - AFAIK it should integrate directly with the programs mentioned above, certainly older versions did.