You know - I am thinking that a good file to propose is one where you can just learn to release your bladder laying down conciously - for me that would be an adequate stopping point and probably much easier to get too. (Even though that is the biggest hurdle)
I REALLY don't want to loose control* but do like peeing and think that would open up for a broad range and may be a good intermediate step for those who want to go further down the loose control path or just want to be able to enjoy some variations with wet sex. A lot of folks simply cannot let go while laying down despite how much they relax.
* I have tried the train diapers1 route because if you only go in diapers while in a comfortable place you have some control over the situation but it is not working for me yet.