I just found a solution to the eclipse auto scrolling in vista.
Run eclipse in compatibility mode. (windows xp for exmple).
This will stop the package explorer from auto scrolling sideways and there are no weird side affects, except for some small visual things.
You won’t even miss them.
HOW: (just some standard blabla)
1. right mouse click on eclipse.exe
2. click on properties.
3. in the compatibility tab, check the ‘run in compatibility mode’
.4. click ok!
Done.