Can I used normal USB PC game pad for Xbox 360 console

No it has to be xbox 360 compatible

No, the 360 chat pad will not work, but you can connect a usb keyboard to the console and use that

I'd say that now might go but in the future the pad you would feel if you use the batteries while the pad's usb cable to your pc. It would be a waste of time and batteries. I suggest you buy another pad, so one you use for console with batteries
and a usb cable.

I have two charging kits, two Xbox controllers, sn Elite I never use, and a Switch Pro... And all the old xbox 360 stuff and windows dongle. I'm good for spares, lol.

when streaming xbox one to pc - the 360 gamepad connected to the pc works great (dashboard / one games / apps / 360 games / everything else).

wish the xbox one (basically a modified win10 in a console housing) could natively support "backward compatible" wired 360 gamepads when plugged in the one usb port.

sadly thats not the case in moment.

In seven of ten cases I prefer the 360 gamepad over the one game pad - but i super like the new one d-pad on the controller (personal opinion)

are ms xbox one console software developers read in the forums?

I'd say that now might go but in the future the pad you would feel if you use the batteries while the pad's usb cable to your pc. It would be a waste of time and batteries. I suggest you buy another pad, so one you use for console with batteries and a
usb cable.