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Beat Level 30 on Mayhem just now. Finally. =D At first I didn't think to do it that way to be honest, I couldn't see it I'd tried so hard with other methods, thanks guest, you were a great help. Got Present and Sunsoft modes to do now, I'm on mission 9 and 4 respectively there but I got stuck and went back to Mayhem.
As for Just A Minute and Just A Minute Part 2, the way I did it was to have the first 4 Lemmings bash forward making sure none of them turned round, then when the 5th one arrived I turned it into a digger just behind where the 4 bashers currently are. When he's dug down far enough so that Lemmings can get back up and go into the shredder to the left of the Hatch, I get him to bash. If it's done correctly, the Lemmings will still be able to walk forward to the other 4 bashers due to the angle of the bash, but not back the other way. Crank up the release rate to 99 and it worked on both levels for me. ^^ I usually have 0 seconds to spare in that the level is already blacking out due to the time limit, but there's about a second of blacking out and that's just enough for me to get all Lemmings in.