Agreed, it would be nice if wallets, transactions and even individual input/output could get a label too. In the spirit of the recent ideas around being more friendly to user who use our app to track transactions for tax purposes, having these labels in the CSV export would be great too.

Interestingly a Bitcoin dev has recently started BIP-329 (https://github.com/bitcoin/bips/blob/master/bip-0329.mediawiki , still at draft stage) attempting to standardize labels for all these elements, it might be a good BIP to follow early, their format seems pretty straight-forward and interoperability with other wallets would be great if there's ever an import/export feature for this in the future.