I stopped reading when you drew an analogy between Bitcoin and cold hard cash.
lol. You are either trolling or totally naive to how Bitcoin functions. You should see how well they mapped addresses in wallets of Silk Road users to user ID's on this forum based solely on addresses in people's signatures.
Yes. It is frustrating how Bitcoin-Qt never tells you about your change addresses, and does not let you pick inputs when creating a transaction. The last transaction I sent, Bitcoin-Qt pulled from like 5 separate addresses in my wallet when it could have easily filled the needs with 1 or 2 at the most. I pulled up the transaction in a block explorer and was like "Gee, thanks, asshole!"