Upps - second try.
0) Rssbandit for Windows 1.9.0
1) I use the Optoin / display / mark read after displaying (my translation from German)
After stepping with SPACE the feed entry does not change to read state, if displayd in the preview.
2) I like the stepping with SPACE bar. My feeds are sorted with the newest entry on top. Using SPACE jumps to the oldes unread entry. Please change the stepping to go to the newest entry if the order is set to this. Top down stepping in the list is more friendly.
3) the use of Ctrl-Q should changes depending of the focus.
Focus o the feed (Abo) is OK to mark all as read.
Focus on an feed entry should mark only the feed entry as read.
I like to use Ctrl-A Ctrl-Q for the old behavior.