Could you please make "Concurrent SNGs to keep playing" numericupdown instead of textbox? I am adjusting its value many times per session and it will save me some time.
And second, it looks like "Max SNGs to play" checkbox is not used at all. Even if its value is unchecked and corresponding textbox contains nonnull value, sensei will stop after reaching target number. Either remove the checkbox, or make make it work as one would expect.