support for Function buttons on Trackball Elecom Huge

Hi,
I tried to map the buttons of my new Trackball Elecom Huge M-HT1DRBK.
Some Buttons (Fn1,Fn2,Fn3) are not recognized.

Steermouse logs the following events for these buttons (click/release):
0001-0002-01 01 20 ** ** ** ** 00 00
0001-0002-01 01 00 ** ** ** ** 00 00
0001-0002-01 01 40 ** ** ** ** 00 00
0001-0002-01 01 00 ** ** ** ** 00 00
0001-0002-01 01 80 ** ** ** ** 00 00
0001-0002-01 01 00 ** ** ** ** 00 00

The other buttons work in bettertouchtool:
left button:
0001-0002-01 01 01 ** ** ** ** 00 00
forward/backward side button:
0001-0002-01 01 10 ** ** ** ** 00 00
0001-0002-01 01 08 ** ** ** ** 00 00

other infos logged with steermouse:
VID:0x56E, PID:0x10C, MID:0x0, USB, DevVer:0x110, BtnCnt:5, DevCnt:1

The Trackpad has 8 buttons + tiltable scrollwheel
The original driver / tool (Elecom mouse assistant) does not work at all- it crashes on starting up.

Is there a way to use bettertouchtool to map these buttons?

It seems the 3 buttons are just usual Mouse buttons 6/7/8 but the descriptor reports only 5 buttons. So BTT is not listening. A solution could be to add a possibility to override the button count in BTT standard mouse preferences manually. Other Elecom devices would benefit of this setting, too.

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