I think you can join the wiki and change it yourself. There will however be some updates to the descriptions and oem numbers in the future (I think) so it is possibly not worth it at the moment.
An easy way to find out the OEM of a button (except the standard ones) is to open the screenset in Screen4 and then double click on the button or LED in question and you will see what the OEM is. Standard buttons such as Start, Stop etc may just tell you that and not the OEM code so the list would need to be referred to for them.
Hood