I managed to successfully connect my MoGo Bluetooth mouse to N800 after some consecutive failures.
I first tryed to find on forums the xterm utility used for send Bluetooth commands (which by the way I didn’t succeed... and my memory don’t helps me), but I found an interesting post about clearing Bluetooth setting necessary on pairing failures. The Idea is to delete /var/lib/bluetooth/[your_bt_mac_id] folder and REBOOT the tablet.
After this step I used the Bluetooth manager, found the device, tried to pair, entered 0000 as code, and pressed a button on mouse.
I got the successfully paired message.
Hope it will work also for you.

Thread Suggestion:
Please continuously update the first post with the latest successful method of using mouse and make cursor visible to be easy for everyone to find best way of doing it. Is really hard to search on all posts to see what works.