I'm afraid I don't really know the answer. I've looked at the way BIAB handles 5/4 and it definitely shows exactly 4 beats to the bar, but played as 5 beats to the bar, so this is somewhat of a conundrum as to how to actually correctly enter 5 beat notation.

Others may know more, but I think you are exactly right in saying that the maximum number of beats to a bar is 4 in the BIAB product.

BIAB appears to divide 4 beats into 5 intervals (or something like that).

Bottom line, it doesn't follow any defined music rules, it's some sort of awkward workaround.

This is with the demo song 54_EVEN.STY loaded (Gimmie Five):

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It won't allow 5 to be entered for the number of beats.
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