opendous-jtag support for independent USB drivers for JTAG/Impact/Chipscope?

Hi,

Probably most Linux users working with Xilinx tools use the excellent
drivers written by Michael Gernoth and available at http://rmdir.de/~michael/xilinx/

I'm looking for a way to embed the whole USB<->JTAG converter into
device, so design should cheap and efficient.

Last time I started to use them with FT2232H chip connected directly
to the JTAG pins of FPGA.
The result were acceptable, but speed was quite low.
I think, that significant improvement could be achieved by using CPU
driven JTAG hardware instead of FT2232H - e.g. the opendous-jtag
http://code.google.com/p/opendous-jtag/

As the drivers are open source, it should be possible to add support
to opendous-jtag (maybe with slightly modified firmware). Before I
start to do it myself - has anybody tried to do it before? Any hints,
pitfalls?
--
TIA & Regards,
Wojtek Zabolotny