Medium format is mostly out of the question for me because of a few things. 35mm gives me much more resolution than I need. I have about a mile of 35mm in my freezer and I would prefer not to have to learn to use a new film. Also, I need as much depth of field as possible in these situations, which medium format can only give me at smaller f-stops, thus increasing the needed flash output.
About the digital thing - I appreciate the concern, but there is no need to worry for me. I borrow the camera from my brother, who bought it used for almost nothing, I have the computer already and I only use free software.
On a completely different note I just realized that flash bulbs and FP-mode flash isn't really useful for me, I need the very short duration of the regular electronic flash to freeze the action. Also, I use two to four flash guns at a time, making the use of flash bulbs very cumbersome
Still no opinions as to whether it is possible to make an ultrawide lens with a leaf shutter?