As I did a quick Zune GUI for minunzip (which now was also ported to AmigaOS4 by kas1e), Carsten Siegner sent me the sources for his MorphOS program "InstantZip". Thanks for that!
It was a little bit hard, to get it compiled and at least somewhat working on AROS, especially, if you only have a few minutes spare time now and then to fix the problems.
As it seems, AROS ListView does not support mulitselection, I switched to NList-classes and now it has some basic functionality, it can at least extract single files from an archive, as you can see below.
It might still take some time (and motivation..) to get it in a releasable state, but it might happen eventually ;).