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Three ideas based on interactions I had with a novice just now suggesting this needs more work:
1) lift the inability to put lessons into miniskills from level 10 to level 40
2) apply the inability to put lessons into General Skills (vision, avoidance, etc.) until level 40
3) when people who haven't trans'd at least their primary class skill want to put lessons into a non class-skill, give an OOC warning/prompt asking them if they know what they're doing and telling them Class Skills are usually the way to go, and that they should proceed only if they're certain. Also maybe tell them to join a House.