Fix the group layout.
Change rest of behavior tab layout.
Rename various labels and texts.
On more careful examination, "Group only when the Task Manager is full" option, does not affect grouping, when "combing into single button" is disabled.
Flipped back the order of the 2 options, and brought back the condition and text.
Originally didn't include the bug report into the summary, because my request was: Add a 4th option, to affect option 2. IMHO these settings are confusing.
If you would welcome such a change (or similar), maybe need a new, clear bug report.
@ ngraham I made you go out of your way again. This time you even took responsibility for a mistake you didn't make :(
I shall be more careful. Well... I'll try.