My suspicion here, just in case no one elsewhere has said anything, is that data type 4 is "file" and tells anything that references it which files to load. Brawl loves to crash if you try to reference files inappropriately which would probably explain why this data type causes crashing when used inappropriately. In the case of Heart Swap, I bet it's helping it reference files so each player is controlling the right characters at the right times.
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The jab stuff is pretty evident in PSA; it's one of the RA-Bit variables; a quick gander makes me think it's 16 but I'm not 100% sure. In any case, just play around with it, and you should be able to figure it out pretty easily.
I think you're pressing the buttons too many times if you are going to rapid jab "automatically". It only requires one properly timed button press to go to the next jab in the sequence, and this holds true even if that jab is a rapid jab. If you want to do a jab sequence and terminate it right before the rapid jab, simply only press the button the appropriate number of times to do that. This is easiest to observe with Mr. Game & Watch who has only a jab1 and a rapid jab. If you press the A button during his jab1 (even only once!), he will then do rapid jab. If you wait until the jab1 has ended to press A, you can do another jab1.
Other than on Pit who has a very odd jab combo with multiple possible outcomes (a rapid jab and a jab3, which based on my casual experiences and not careful testing is decided based on how much you mash), you shouldn't even think of rapid jabs as requiring rapid button inputs. Just think of them like normal jabs for which you can hold the "A" button to extend. The fact that mashing also works is incidental.
![[TSON]](/data/avatars/l/114/114196.jpg?1360761019){kind=avatar}
