Gon Tek
I stand to be corrected (OK, no I don't because I'm sitting down), but there is no 'type rating' for wobbly props or windy up and down gear. A SEP/MEP rating covers all variations on a theme, although in practice you will find most clubs/groups will want to see evidence of previous experience on a particular variant or insist you undergo familiarisation training. There is no additional endorsement to the rating in your licence to specify additions to the SEP/MEP rating, which I am sure you already know, is valid for 2 years.