ChinaV,
it seems an excellent idea to create our own map of routes, scenic rides, place marks and other bike related pois

However, even the best database, platform or software is useless without proper input and regular updates of the content. This is the major concern when establishing such a database in China, where things change so fast.
- The bike or parts shop was here a month ago, replaced by a high rise apartment building three months later
- Where you rode the dirt road pass last spring, you'll find a 4 lane expressway today - forbidden for bikes

Sure, it is worth a try and I'd also be willing to contribute to it.