Default [Q] star b92m - usb debugging

Hello,

I have a question. Maybe someone can help.

I have a old Star b92m and the touch and lcd is broken.
The driver are installed and flashing is also possible. But I have not switch on USB Debugging.
But I need it.

ADB Connection over CMW Recovery is going well. But how i can do this also when the Phone is booting normal ?
I have edit the build.prop and write some lines in it.

persist.service.adb.enable=1
persist.service.debuggable=1
persist.sys.usb.config=mtp,adb

But nothing happened.

Is there a Custom ROM where USB Debugging is switched on and with SP Flash flashable ?
Or is there some other way to become a connection to the phone ?

Why this ? I like to have the phone for other things. Like webcam or so.

greertings

micky1067
sorry for my bad english.