By default, albums and images are always separate for me. So no images in parent albums, but only in the lowest level. But, there are exceptions where it makes sense. and I have such an exception, or I had a hard time to decide, but it is good.
I have made the basic theme too responsive. You then no longer need the setting "x thumbs in a row". There are always as many thumbs displayed next to each other as there is space. However, I have equipped the theme with a max-width, because too much responsive is not good either.
But, at Gallery3 I had the thumbs with width: x% and they have enlarged and reduced to a certain width. The setting "x thumbs in a row" makes sense again.
With the problem with the album and image thumbs I have just seen that it is a matter of the theme. So it would be customizable in the theme code.