Empower xsane to directly create multi-page TIFF with Fax G4 compression

Hi,

I'm missing a comfortable way to create multi-page TIFF with Fax G4 compression directly with xsane.

Currently I have this inconvenient work flow:

1. Scan several pages with ADF with 300 dpi grayscale.
2. Save one after the other temporarily as single PNG.
3. Use IrfanView to edit and compose each page ...
4. Manually increase the contrast and adjust the luminance.
5. Decrease the resolution to 200 dpi (this is the common FAX resolution, good for normal text), see #17.
6. Save all pages temporarily as single TIFF with Fax G4 compression.
7. Combine the pages to one multi-page TIFF.

Is it thinkable, that xsane could do all these steps in some future version? Additionally a saveable custom configuration would be helpful.