Indeed. I was actually trying to help another DVC owner in another forum and discovered the II/DVC docs were clear as mud. I tried emailing the DVC Member Satisfaction Team -
dvcmembersatisfactionteam@disneyvacationclub.com - and they basically said, 'Way above our pay grade...you'll have to call.' Which I eventually did...the results of which follow below. That said, I still don't know of anyone who has actually put their DVC points into II so don't know anything for certain.
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I finally got around to calling about booking Interval International from DVC. After a little over an hour's wait I got some answers...though things are still hazy around the edges. Note that what follows is just what the CM knew to the best of her knowledge.
First off and despite the verbage in the II DVC Buyer's Guide, you can make Deposits into II using DVC points.
Second as it currently stands, the online DVC/II Portal only really works if you have one membership at one resort. Even though it asks which membership you want to use if you have more than one, you have no control over which resort the portal pulls points from.
However, if you call you can choose which resorts and memberships to use for a "Deposit", "Vacation Exchange", or "Place a Request".
There is a bit of trickyness about use years. If you make a "Deposit" you pull from the current use year only (and can bank and borrow subject to the 50% limit). But if you do a "Vacation Exchange" into a vacation in a later use year you have to pull from that use year's points.
Note that the Portal has an additional glaring deficiency in that it requires you to accept trades up to 4BRs when you "Place a Request". The only way to avoid being on the hook for large numbers of points is to only select resorts that have villas with the number of BRs you desire and none larger.
Unanswered questions.
What happens if you "Place a Request" with multiple dates that span multiple use years?
And I forgot to ask, If you call to make a request can you choose a maximum villa size less than 4BRs?