However, it would be helpful if people were made aware of the detailed circumstance of how they convicted him and why the sentence was so severe. i think that it would would need 100% foolproof evidence to hand out that punishment
Well, it can't have been 100% fool proof. Criminal charges were dropped due to an inability to meet the burden of proof in a criminal court. In civil court, the burden is only "on a balance of probabilities", in other words there is still room for doubt.
In the various articles the tribunal chairman has indicated he does not believe Stephen Lee to be the architect of these incidents, rather someone who was taken advantage of. And it apparently wasn't proven that Lee ever deliberately lost a match that he was able to win. Instead, he conspired to affect certain frames for betting purposes. For example against Mark King he was confident enough of winning that he deliberately dropped the first frame, but still went on to win the match. That said, it was cited that Ryan Day beat him by a prearranged score. But perhaps that was never fully proven.
http://www.bbc.co.uk/sport/0/snooker/24270974 - some the info I mentioned is towards the bottom.
Given the lesser burden of proof, I think a cue sport wide ban would be a little draconian. Coming to pool, he can not maintain the same level of income had he been playing snooker, so it's not like he's skirting any sort of punishment by playing professional pool events. Last year he won £70,000 ($112,000) for his victory at PTC Grand Finals. Shane Van Boening or Dennis Orcullo hasn't won that much in 2013 after almost a full year of competition, let alone one tournament.
My call would be to let him play in pool events, but put him under heavy scrutiny with a zero tolerance policy. Any inkling of dumping, match fixing or even splitting the finals and he's out.
Too bad all of this has overshadowed the fact that we just had the first ever all Chinese final in Shanghai.