To hire Slay you need copy this file "064.npc" to Alliance folder, like this one:
"..ja2\"
So, if you see already Richard you need start new game, if not... look for him.
He can be joined to your party... You need give him an item... What sort of item?
So.. I thik you really don't want this *spoil*. So it's new and interesting puzzle...
Try your luck! maybe we - russian not so stupid... :) GOOD LUCK!
In my JA 1.05 (eng) and 1.02 (rus) it work!

P.S. Hey, Ian!... Maybe in 1.07 SirTech put Richard into game? ;)