I think more should be made of the hall of fame. Regual inductions for one thing. One or two every year at the man of steel awards for example. Have a short list like the NFL then it is a bit of an event and story.

People from the super league era who'll probably be in are Peacock, Sinfield, Farrell, Sculthope, Cunningham i would have thought

Jiffy should be in before most of these named here. Sensational domestically, did the business in Australia and wasn't too shoddy at international level either.
One of the very very best all round backs in my living memory.

Does not qualify not played 10 years

I think a very high standard is just what should be maintained, so that we are looking at perhaps 3 players per decade. Of those mentioned above Clive Sullivan has a strong case. Not just a very good player and a World Cup winning captain whose individual brilliance helped get that cup but he is also made history as the first black captain of a British international side. Sometimes, OK often, we undersell RL and are the games biggest critics, but instances like this are something the sport can be rightly proud of. So, great player and historical icon, put him in!

Of the others discussed Andy Gregory certainly has a case, he was a much better player than Edwards, then again Tony Myler was, Schofield was (but he's in anyway) and Davies was but as pointed out doesn't qualify.

IMHO the Hall of Fame should be directly linked to the RL Heritage Museum and a permanent display to honour the inductees, and their achievements, to educate people on the great RL heritage (and perhaps to remind people that RL existed before, and continues to exist outside, the boundary of Super League).

Unfortunately the Heritage Museum isn't due to open at its new home in Bradford until 2020, a somewhat sad reflection about how the game portrays itself and its former players.