I have found a website which explain how to do this.
http://thelemming.org.uk/maemo/btmic...use_readme.txt

But you need to be with the good version of the kernel on the 770, I used the SU-18_2006SE_1.2006.26-8_PR_F5_MR0_ARM.bin

It would be possible to adapt this to the N800, the patchs are on the site.

That work fine on my tablet now.

I use it with an Apple Mouse and a kensington.