Sorry, but we can't reproduce this.
Ctrl+V always stops after current for me, regardless of how many tracks are in the JTFE queue or not.
Re "NEXT song (B)"
That is a feature of the JTFE plugin (gen_jumpex.dll).
If there's any songs in the queue, then clicking Next from a stopped state will play the next song in the queue (without the need to click Play).
Though I did manage to find a bug with Shift+V (stop with fadeout).
It fades out and then I get a split second or so extra sound before it finally stops.
This only occurs when DirectSound Output is active, not WaveOut,
and the length of extra sound seems to be determined by out_ds buffer lengths.
Note, I'm replying to this as a result of your crosspost/reminder message here