Xplorer4x4

I am trying to customize my ini files for my mods to get the menus assigned to the keys I want on my controller for gta v on pc. Most buttons are pretty obvious, A,B,X,Y, but my concern is things like R1,R2, and R3. Also, my controller has 2 extra buttons on the back I would like to map. I also notice that in the game standard.meta file the key bindings are in a strange format. 
<Item>
            <Input>INPUT_RAPPEL_JUMP</Input>
            <Source>IOMS_PAD_DIGITALBUTTON</Source>
            <Parameters>
                <Item>RDOWN</Item>
            </Parameters>
        </Item>
<Item> <Input>INPUT_RAPPEL_JUMP</Input> <Source>IOMS_PAD_DIGITALBUTTON</Source> <Parameters> <Item>RDOWN</Item> </Parameters> </Item> Is there a cheat sheet for both gta 5 and lspdfr that will help me with key configs? 

Channel 7 News in Australia ran a story regarding LSPDFR yesterday, misrepresenting that LSPDFR and other modifications are used as a simulation for killing police officers.  This has since been picked up by other media outlets, as well as the gaming press.  Obviously, this simply isn't the case, and you can read our statement regarding this matter below.