So, two issues.
1) No, you should not have to increase rpm to keep the engine running while it warms up.
2) Yes, you can put the boat into neutral and rev the RPM's without engaging the transmission and putting the boat into FWD or REV.
Depending on your shifter, you either push a button on the center of the lever fulcrum, or you pull the handle out while it is in neutral. This will allow you to rev the engine without putting it into gear.
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