Do you plan adding support for non-deterministic wallets? I don't think I would like to use a deterministic one. (I can't really give a reason why, I just don't like the idea.)

Also, if the client will not do block validation, please keep the option to only accept blocks through the satoshi client.

Edit: Oh, by the way, I mentioned I can't create transactions with insanely large transaction fees. Here's the error message I get when trying to send 1 satoshi with a 2200 BTC fee: "SelectCoins returned a list of size zero.  This is problematic and probably not your fault." I don't think this is a real problem, but I thought it's worth mentioning.