Feature request to add a one-time flag to labeled Tx addresses such that the label and address remains in the address list for historical transaction identification, but can't (easily) be selected as an address to send coins to in the send tab.
Since addresses are supposed to be used only once, this would avoid:
- Unintentionally sending BTC to old/unused addresses.
- Cluttering the address book with addresses which will never be used again by hiding them, leaving just addresses which may be used again (friends, mobile wallets, cold storage, etc.).