Oh wow, that is so bad. I can't believe SAP would have a UI and functionality so badly implemented.
Thanks for the info Siddharth.
Even after implementing the note, the STRAS field wont allow spaces and it saves with the additional spacing characters, like: ｍｙｓｔｒｅｅｔ
Our HR department would never allow us to put something like that in front of our users.
I checked the screen in PA30 and it appears they decided to use the standard 2000 screen instead of the 2042 screen, most likely due to this issue.
I created a Z copy of the HRESS_CC_PER_DTL_ADDRESS_TW configuration and changed the Feeder Class Parameter to use IT0006 instead of IT0006_42. Then built the page to match the standard 2000 screen used for Taiwan in PA30.
But it is still applying the same validation and string manipulation for STRAS 
Is there a way to not enforce the TW validations in ESS Pers Profile or is my only option to dig into the code and remove this functionality?