Well. I don't speak English very well, so please don't be angry.
One of much annoying thing is impossibility to select more than one disk image by mounting it in basiliskII or SheepShaver. If I have for example, 7 disk to mount is really exhaustive to mount first disk, than second, than third...Is it possible to make "select all" and mount?

I am not sure what you mean. Is this about adding disk images to the volumes list in SheepShaver preferences or BasiliskIIGUI or is this about mounting the volumes in SheepShaver or BasiliskII? You can have multiple volumes mounted in SheepShaver or BasiliskII at the same time, but you need to add them all to the volumes list in preferences or GUI and that is done one by one.

Yes, it is about adding disk images in images list in BII or SS. There's no option "add all selected" or something like this..