That's not such a big problem anymore. Currently there are weekend cross straights flights by both the Taiwanese airlines and Chinese mainland airlines, no need for a stop in HKG or MFM anymore if you're traveling on those days. As already mentioned several of the FF programs are partners now between the mainland and Taiwanese carriers.

There did seem to be somewhat of a formal announcement that CI was supposed to join this year but doesn't look like it'll happen by the end of the year now since no more news has been put out there. Personally I'd like it if CI would join up since this allows a lot more option intra-Asia than we have at the moment. I really don't mind CI's Dynasty Class and in some markets its priced pretty competitively though their BS 7kg carry on rule is terribly annoying. I can see this in coach where the overhead space is more limited in relation to the # of pax but in business seems totally unnecessary. I'll never understand carryon luggage being limited by weight rather than size.