Can I put my indicators on a different key than 7 or 8?

No.

I dont know about the keyboard, but if you've got a logitech wheel, you can use Logitech profiler to bind key presses to wheel-buttons. I guess other wheels have similar utillities

Will the logitech profiler work on another wheel?

use a nice little program called Joy2Key - will work on any joypad, joystick or wheel, and map to any key and set (e.g. LShift+S)

Thanks guys