I have had Xeloda twice, first after diagnosis along with oxy and Avastin. When I had a lung recurrence 3+ years later, I had removal of met via VATS (easy surgery - is this not an option for you?). I did Xeloda + Avastin for 6 rounds and then Avastin for almost another 2 years. So technically my Xeloda the first time was first line treatment and adjuvant with respect to the lung recurrence the second time. The dose was the same each time (2000mg twice a day).
I don't know anything about a maintenance dose - obviously your suggested dose is much lower than the typical non-maintenance dose. But, regarding the 5 days on / 2 days off, this protocol was an early one used by Dr. John Marshall (either George Washington or Georgetown medical - can't remember). (You can search "John Marshall capecitabine and hopefully find more info.) On my second use of Xeloda, we tried this 5/2 protocol one round due to my side effects. I loved the weekends off, but overall, for me, the 1 entire week off after 2 weeks on was better for me re: side effects. So, we went back to that. With a lower maintenance dose, you might find the 5/2 more tolerable - it's all so individual, and it can always be changed.
Take care, (P.S. - if you do look at John Marshall papers etc, you may think he is arrogant because he says things like "my protocol is the best" or "I am the best GI onc there is". My oncologist tells me that he loves to talk this way and they (oncs) all love him - just mentioning in case you read any of his stuff.)
diag. Stage IV, 5/05, liver met
lap sigmoid colectomy, 6/05
6 cycles Xeloda/oxaliplatin/Avastin (NED after 2)
11/08 9x13mm right lower lobe lung nodule; removed via VATS 4/09
6 cycles Xeloda + Avastin
Avastin only 10/09-5/11
Still NED 06/18