Hi Guys,
I have actually found a solution to this after my post. So if anyone is interested in getting modern pedals working in GP4 see below.
I suggest downloading the following program [
vjoystick.sourceforge.net]
Universal Joystick remapper. you will need to download the vjoy driver which basically is a virtual controller. that works with the remapping software.
Basically you can remap your pedals to the virtual joystick (which works for wheels too) as another axis, in my case i switched it to X and Y Axis. Once remapped leave UJR open. Load up GP4 and what i've done is used "control A" as my Pedals remapped so for brake and accelerated you use control A. and all other steering inputs i use controller B which is my T300 wheel. this preserve the force feedback etc and saves you remapping all other buttons to the virtual controller.
If anyone is interested i can create a brief guide of the steps required. The above is just a general overview.
Cheers
Daniel