The pinyin for Changping Dongguan is wrong. The map states it's 'Dongyuan', while in fact - it is 'Dongguan'. The Chinese name of the station is correct, only the pinyin is wrong.
I found that it is not possible to tap on any of the final stations at the top of the map of the Changping line as one’s destination — the red box indicating that you are planning a route lies on top of those stations... Please fix this.
I would find it useful to have a button for calling a taxi at current location and having on-screen instructions (for the driver) to reach the closest subway station.
All of the stations on the Taipei metro have been numbered. So, in addition to their names, a station will have a designation like G01 (Xindian Station, the first stop on the Green line). Mapping services and advertising is beginning to use these identifiers. It would make planning easier if the maps in the app all showed the station number next to their name.