Yes, this is a big one for me. Without this I need to duplicate categories (e.g. "business meals" vs. "personal meals", instead of one category called "meals" and one tag called "business").

totally agreed! When I split transaction and get refunded for a percentage from a friend, id like to be able to omit the transaction that my friend is refunding me from income / budgets, etc.

I'd love to be able to have a "Reimbursable" tag (for stuff that my work will reimburse) that won't show up in my budgets! e.g. work travel shouldn't count for my travel budget