From the Taipei Times (link):
A private constitutional reengineering group yesterday unveiled its first version of proposed constitutional amendments, which would give the public the ability to initiate future constitutional revisions and adopt a two-house legislative system.
Currently, only the legislature or the president can initiate constitutional revisions.
The group did not make a recommendation on whether Taiwan should have a presidential or parliamentary system, and avoided the issues of the national title, flag and anthem.
See also – “Taiwan constitution” by Wikipedia; – “Taiwan ponders constitutional reform” by BBC News