You answered your own question.
The player must relese the ball on a pass directly into the court within 5 seconds. There are no other movement restrictions, what he does to the point he inbounds is moot. The only implied restriction is that the pass cannot touch OOB, before going inbounds.
When the NF wants to restrict some action, they outline the restricted action with the related section. If the NF wanted any other actions during an inbound play to be a violation, they would have put all restrictions in this area of the rule book. This is why the three foot space is outlined in the spot throw in section.
Don't go looking for violations that are not there. There are plenty obvious things we can get without stretching the rules like silly putty.
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