This would be a kind of white-glove service add-on where an actual crypto tax specialist works with you to find/fix all missing/incorrect transactions (due to API issues, pending exchange/wallet integrations, etc.) so that what you see in CoinTracker represents your real portfolio to 100% accuracy.

allow CPA to edit transactions, but through a separate login than account holder's

Necessary for price to volume stability tracking and cost basis analysis moving averages/month graph., or provide partner sources.