Of course, the BEST solution is to mount the outboard in a well immediately inboard
of the transom.
Sure, there's a bit of work involved: Cutting a hole about 18" square in the cockpit and the bottom of the boat, making up an open-ended box out of ply, glassing it in place and re-fitting the outboard bracket... But you do get the following advantages:
obstruction to rudder or tiller movement (the outboard cowling is now underneath the tiller, not beside it)
over-revving in steep chop when the prop clears the water (it can't).
weight hanging over the stern (better trim).
risk of dropping the thing overboard when lifting it in/out for maintenance.
5. You can maintain the thing without risk of falling overboard or losing parts into the briny.
6. Reduced risk of theft (if it ain't there, it can't be pinched!)
7. The boat looks more like a real yacht.
The only disadvantage is the work involved to do it.