Okay, I miss read what you wrote, none of the two options you described is correct.
IRL the TDC hat is 5 way (up, down, left, right, press). It's used to move the TDC and the press movement has 2 functions:
- When in SCAN mode (RWS), it locks the target under the TDC in PID mode (TWS)
- When in PID (TWS) or PIC (STT) mode it will alternate between the two (PIC is not always possible).
The "TDC center" button does not exist IRL, it is a "game" function that is used to reset the position of the TDC on the radar screen.
You have a diagram in the manual with the real HOTAS layout that might help you with this.
If you still did not understand I could take some more time to explain it to you with those diagrams, I hope this helped.
EDIT : To clear all possible confusion, current implementation is correct, the only thing that would need to change is the control names/description.