My personal view is that permanent skills preassigned to lemmings don't need the same level of attention drawn to them as neutrals or zombies - keep in mind they'll have athlete colors, and have icons show up next to them (or the entrance they spawn from) at the start of gameplay that shows exactly which skills - and I'd also be concerned about the "combination explosion" potential here - for example, what happens with a level that has, say, one lemming for each permanent skill with that skill, then several lemmings that have (different mixes of) multiple skills, some of which are zombies and/or neutral? Don't forget that pre-assignments can be blockers or shimmiers in addition to permanent skills, too. You can see how this would quickly run out of space.