When you compare the historic info that's available online, the official site is laughable. Its been getting better, with adding Ken Dalby's year by year descriptions (albeit rather disgracefully not credited). But there's nothing on past players or matches except that. Mind you, they used to have a random selection of 80s and 90s player photos on there with no information on most of them. That was probably worse than nothing at all.
I've had a look at other clubs, and for both Wigan and Sts you can find all sorts of facts and figures, including lists of all players. IIRC Leigh have a list of all players somewhere. For us, like you say its as though there was nothing before 1996 of that sort.