Is there a described mechanism for transferring shares from BitFunder to Crypto-Stocks?
Sell on BitFunder, buy on Crypto-Stocks. But the consensus is good luck finding a seller on C-S if you are after any kind of volume.
Everyone is so gun shy around bitcoin in general and securities in particular...
I'd venture to speculate that there's going to be a long wait period before we see any decent implementation of a decentralized (colored coins, etc.) exchange, with enough community trust, to be up and running at full volume...
TL;DR: direct shares and no daytrading for awhile.