Yeah 2D classification is still not available - would definitely be useful!
In the meantime, in Class2D switching off sigma annealing (set the iteration to start annealing to 200 or whatever) and reducing the max alignment resolution (e.g. to 15 Å) can both help reduce the attractor effect that ends up sucking the edges & other high contrast junk into your good classes.
Cheers
Oli
E.g. see here re sigma annealing: Limiting the number of particles per 2D class - #8 by olibclarke