Yeah there isn't really a way to do this, I mean you could write your own tool (either by scripting photoshop or by writing a PSD importer) but it's definitely outside the scope of what Futile does. Have a look at something like Slicy too: http://macrabbit.com/slicy/
Yeah, that link has some good info about setting up Futile for pixel art. But I have that working. My main problem is generating the bitmap font files at a proper size.
For example when I use this font: http://www.dafont.com/volter-goldfish.font
The font is listed as 9px high. If I use that font in photoshop and set the font size to 9 pt and set the anti-alliasing to 'None' it will look very sharp. That's the look I'm going for.
If I use the same font in GlyphDesigner it will look unreadable (very blocky) without anti-aliasing and very blurry with anti-aliasing. So neither option results in a bitmap font file I can work with.
I did some more digging and found another tool that can also generate bitmap fonts: http://renderhjs.net/shoebox/
It's a bit of a hassle to get working but it uses an image that you create yourself in photoshop as the glyphs for the final bitmap font so you can feed it any style/size of font you want. I've been playing around with it a bit and early results look very promising.