Would love the ability to create your own predefined groups of dates to quickly add/update backtests and strategies with blackout and specific dates. Then simply add the groups of dates similar to how tags currently work via a dropdown (Holiday Weeks, FOMC Days, EOM, OPEX, etc) in the blackout/specify dates and only need to update them once under the date group rather than every backtest and strategy individually. Also would really help see which groups of dates are in the backtest rather than just a jumbled mess of comma separated ISO dates.