Camera memory card modes

triggered by seeing the specs on the new Olympus E620 camera (which has 2 card slots, including the stupid xD format) I had some thoughts about how cameras use memory cards. This led me to the following ideas:

• Have all cameras take 2 cards, either 2 CF or 2 SD (not mixed - hear me Canon)
• Combined with the 2 card slots, have 2 buffers. Not sure how feasible this bit is, or where the buffer limits lie. essentially I want to get more shots in a burst.

Have some flexible card writing modes. At present we have both together, or sequentially or RAW to one and jpeg to the other. That's all fine. Here are a couple of others that I'd like:

• A-card priority. That is, if there is a card in the A slot with space, write to that first. Even if I've written some files to the B card. This means the B card is a back-up when I'm shooting lots and need to wait a bit to change cards.
• Alternate write. Specifically aimed at rapid fire mode: writing to the cards alternately. Combined with 2 buffers, and with current read/write speeds I bet even at high frame rates buffer would be almost unlimited. This would also serve a good back-up for card failure with less space taken than complete duplicates.
• I'd like to be able to combine them - that is select card write mode based on shooting mode. Use A-priority for single shot and alternate writing for rapid fire. To be really clever, the mode switch would be based on buffer status: empty buffer use A-priority, buffer (part) full, use alternate shooting.

Funnily enough, all of this comes from my experiences on safari. Often I would nicely fill a card or the buffer just at peak action. Even the 5s or so it takes to switch a card can be too long. Waiting for the buffer to clear can seem an eternity. Sports & PJ shooters would also benefit, I reckon.