Though I only have recently starting posting, I've been around this biz for more than year watching, learning, listening. Here are a couple thoughts with all due respect to those it affects.
Its an old bitch between submitters and LL's who want to be on the index.html page. Other than about 12 - 15 LL's, most don't DESERVE to be on the html page... period and those that INSIST on it are petty. Check your server records and if they don't send traffic ask for hardlink exchange somewhere and DUMP them saving yourelf time on the submits they'll come around eventually.
If a LL on its rules page insists on index.html placement, he gets what he asks for, and then the submitter is clever enough to use htaccess to get around it (I would never do this and I really don't know why anyone would, where's the benefit, just piss people off?) then it seems to me a bargain was made and kept and there shouldn't be any crying later. A deal is deal. Stand up. Besides, a majority of webmasters I've seen (most new ones less than a year or so) don't even know what or how to use htaccess.
http://www.freewebmasterhelp.com/tutorials/htaccess/
More importantly think about the long term. Its not just clicks now, its PR later too. Any page with inbound links from decent sites is going to gain PR. I've done searches and often found several pages from the same site in the results. I almost always check these out on the thought that there must be something there if so many pages are indexed (they will be indexed if you change your content around and work keywords). PR benefit accruses to the LL' too regardless where the pages are or what they end in and actually PR benefit to an LL is greater because the inbound link is usually focused on a category page.
Finally, for submitters making doorwways, I recommend making them logical and intuitive:
yoursite/teens/jan/
yoursite/anal/feb/
or
yoursite/tits/0065a
yoursite/milfs/0065b
and then sticking an index page into the
teens, anal, tits, milfs, directory. This is because surfers (especially porn surfers) are pretty clever themselves and if they like your pages they'll keep digging and just delete off the page id and try and peek into the directory. Your index will come up and you can keep them longer and maybe sell them.
Finally, its really about your site 'cause they'll check that out too and if its quality maybe even bookmark it and come back, and back. I've found that really most of my sales come from my site pages which brought surfers in from a free site submit.
You don't have to and shouldn't just rely on free site sales. If you're not equipped to be here for years then you shouldn't even try. Properly contstructed doorway content (all pages except maybe the pics directory) should be in its own directory, new text, reordered keywords, etc. because there is also going to be a "content size" benefit from the SE's regardless of the placement of that particular page in search. In otherwords you will get a slight ding of your overall sites importance from SE's on the basis of your total site size. IMHO
