They made interesting machines, is Edward B not on here? I remember he would engage on forums and was always open to ideas. Can't say I really got on with Trail Blazer but i'm not surprised there is more to it than meets the eye. If you hit the skill 7 style features on 4 would it auto skill the whole lot? Been a long time.
I remember Rise to the Top looked interesting, although only ever saw one in a bookies where a punter was forever on my case. Not the best place to experiment. I liked a Mazooma (maybe QPS) called Stir Crazy, it had a barcode you could play for and one of the features was a true skill cash climb on the fruit symbols. If the skill climb went slow barcode would usually come straight back and do the same again. There were a few of them dotted around and I always did ok on them.
I'm not sure tweaking the Cluedo features around on the £70 versions was the best idea in hindsight, I take it the idea was to make it harder to get number runner and wild thing, but with the features being red on pound stake a super 7 was never far away from a red line entry.