Add information about which stations have elevators.
This would be very helpful for those with wheelchairs or strollers that want to use the metro.
Good news, we have added information about elevators/disabled access to our Shanghai iPhone app. See blogpost for details: http://www.exploremetro.com/blog/access-all-areas-disabled-and-elevator-access-information-now-in-our-shanghai-iphone-app
It would be also useful to know about escalators. In Beijing, quite a few stations have up escalators but lack down escalators, so knowing if they have both directions (and at which exits) would be great. I think I have seen some stations in Guangzhou like this too, as well as Shenyang (no map for this city yet, but as it currently only has two lines, not a priority I'd suggest at this time).