Trying to get extra cores working on 1.5.2

Anyone had any luck getting this to work on 1.5.2 ?

1.0.3 sees them but 1.5.2 doesn't. 1.0.3 it scrolls off the screen and I can't select them all so I want to try 1.5.2 to see if it is fixed since I'll be using some bare AVRs to program.

Which avr chips did you have in mind ?

Well I personally have Mega32, Mega1284p, Tiny45, Tiny85 but am thinking about getting some more Tiny's for really small projects.