you are correct concerning the 5 mph max on the panther steering kit. I assumed that it would place to much stress on the steering bar if you go over 5 mph. However, it can be rigged differently to avoid that steering bar hookup.
What I did is attached it directly to an older cowl of my 25hp that I also use for my motor and was not afraid to drill holes into. Sounds crazy but my 5hp kicker for pymy or leesville dam, just runs along like a charm when I go to other lakes and use my 25hp.
The laziness, is that I do not need the kicker for the bigger lakes and should just take it off, which I do sometimes.