separate trail sections for each ability
smaller learning area
I have skied Roundtop, Liberty and Whitetail as well as many other areas. I like Roundtop because it keeps all the trails for the same ability level pretty much in separete areas. If you ski expert trails you don't have to mix with the beginners. It is a little harder to get to being far off the main highway om confusing back roads but it is worth the drive.
I just wanted to respond to a previous comment. I have worked and lived at several ski resorts in the west and in the east. The reason areas are roped off between trails in the Pennsylvania resorts is that the only snow making is ON the actual trail. They lay down a good packed base and then keep blowing snow on top of the base. They have combed the trail when there is no snow and taken out the big rocks and other obstacles. Since Pa does not normanlly get a lot of natural snow there is usually a very small amount of snow between the trails and most of the tiime there is no snow between trails where there is no snow making. The roped off areas are for your safety. It ususally means there isn't enough snow to cover the rocs,etc and there is no base of packed snow for you to ski on. You would hurt yourself if you tried to ski in these areas. It may look like a good place to ski if there has been a fresh snowfall and the ground has snow on it but you don't know what IS UNDERNEATH THAT SNOW.
Out west they take out more obstacles between runs and they get enough snow to make it feasible to ski the trees but that unfortunately isn't the case in Pa. Compare 350 plus inches of natural snow which is average for annual snow fall at western resorts with maybe 30-40 inches of natural snow in Pa in a normal year. Not of couse like this past week.
Sometimes you have to trust the ski areas- they have your safety in mind.
Another thing- you are correct in saying Liberty Mountain has a bigger beginner area- however to get a nice big area like that they actually had to move the path of a county road and litteally move a small mountain to grade the area. The land wasn't naturally like that. It did however make for a really great learning area. I do reccommend Liberty for the best learning area around Pa. Most beginner areas aren't as long ,wide or have as gentle terreain or served by their own chair lift.