A laser pen is a very good toy to use I live with a motley band of ferals from nice to nasty, some domestics and my pedigrees, 2 Ragdolls, a Barmy Bengal and an NFC oh and their pets our 3 Border Collies
I find that my ferals love the laser pen even the really nasty ones and the nervous ones like the freestanding sort and it means we can all play with the red dot - the dogs love it to but no human touching involved and they come right up to my feet when I shine the red dot
Some cats are just naturally nervous a lot of mine have had harrowing lives before coming to me and in some cases it has taken years to get them to stay in the same room as me using treats and nice things like chicken, smoked salmon, prawns etc that now most stay in the room with me and some are even very brave and can do visitors one at a time
All we can do is love them for who they are and allow them to be all they can be