I haven't got an email back but when I do I will post and also fallow up with them with the newest version of the question.(Though my email is very close to this)

[My understanding] I believe the idea is to ask for all you think you will need to complete one project in one post, then repost if you fail to meet. The segmented method you propose is open to exploitation, because there is never a real stated goal -> one could ask for money forever and never release a product. As a backer I would invest in a game but not part of one that may never get funding for the rest of the parts. But this is not unlike what game publisher do with 'mile stone funding' - meet a milestone to get the next chuck of funding.