Nice to hear that someone other than me actually uses that driver :-)

If you read Russian, the relevant doc is over here: http://zx-pk.ru/showpost.php?p=579938&postcount=144

To enter setup mode, press PrtScr. Cursor should appear in status line at the top. There are 20 settings you can change, in 6 groups (I-VI). Group I controls serial port speed (leave at 9600), groups II-V control 16 setup bits, and group VI is realtime clock. There is no NVRAM. To change a setting, press keypad '*'. Left and right cursor keys move between fields. PrtScr exits setup mode.

Setup bits are:

Group II
- 'cursor shift' [not sure what that does]
- keyboard autorepeat; 0: off, 1: on
- n/a
- cursor type; 0: type 1, 1: type 2 [not sure what that's supposed to do either]

Group III
- margin beep (at position 72); 0: off, 1: on
- key click; 0: on, 1: off
- current command set; 0: set 1, 1: set 2 [set 1 is completely custom, set 2 is VT52 compatible]
- xon/xoff [??]

Group IV
- n/a
- autowrap (only in command set 2); 0: off, 1: on
- auto CR/LF on keyboard input (only in command set 2); 0: off, 1: on
- n/a

Group V
- parity; 0: even, 1: odd
- parity check; 0: off, 1: on
- auto CR/LF [?? on line input]; 0: off, 1: on
- status line; 0: displayed, 1: not displayed