But, instead of the current popular topic of maximum distance lets change the parameters slightly:
Instead of a weightless, windless fluff, lets assume the fly has some significance compared to the line, like maybe a
popper on an 8 wt...
And, instead of trying to achieve the longest cast lets think more along efficiency, like maybe you want to cast all day
while making a PUALD around twice every minute with above said popper...
and, instead of being able to make a few steps, or even shift your weight, imagine you are standing in a canoe...
As you can see, this is an absurdly theoretical question, but I have some evidence that it can be done!

While I have not paid attention in years, over here in the US the CCA at one time had a competition category called "Bass Bug" which, if I remember correctly, was an accuracy comp with a standardized bug and the number of false casts were limited. And, as to not shifting your weight, the last time I watched Mac Brown give a demo he seemed to unconsciously minimize his weight transfer when concentrating of something else in the cast. He kinda looked like a Masai warrior standing on one leg with the other foot propped against the one touching the ground!
For those reasons (and some others) I think the above scenario could possibly be a real world challenge. If so, how would you modify your casting motion to work within those parameters?
Thanks!