Yup, we use fins. They're like a trolling motor to kickboaters.

Most of us do sit while fishing.

Some guys have platforms to stand on and it can add extra weight. I use a 3/4" piece of plywood cut to fit/rest on the frame directly in front of the seat. The plywood doesn't weigh too much and can be stashed behind the seat when not in use. I really don't use it much though.

We do carry our boats but not very far. Once loaded with gear the boats get heavy fast. We'll carry the boat to the water then put our gear on it and launch.

Some guys have devised ways of adding wheels. A good hand truck with fat soft wheels is also a good option.

Rowing speed is comparable to a pram. Kayaks are faster but less manueverable. I've used my kick on rivers fishing for steelhead with no problem.

Your welcome & tight lines
Chris