Hi All,
Seeing a lot of posts on here regarding the inability to rebind certain keys, specifically the KeyPad. I am one of those odd fellows that has been using the NumPad to navigate around since the year dot. I have also been coming across more and more games like this that have locked the NumPad. (Usually console ports, lets hope thats not a bad sign).
Anyhow, I have been using GlovePie for years, a free program (Google it, don't want to upset any moderators), used it with Fallout 3 too, which allows you to remap whatever keys you want for specific games. (i.e Key Press A will now equal NumPad 8, etc). Have tested it on Fallout 4 and it works perfectly.
I'm sure the game will be 'fixed' at some point in the near future to allow you to choose whatever keys you want, but until then give GlovePie a go.
Its very simple to use but if you need any advice just ask.
Happy Gaming All.