This would be really helpful for bespoke lists. Currently the process is very time-consuming: you have to look up the constituents, record their IDs, enter a query for the specified IDs, then convert the query to a list. A simple 'add to list' button would make this much quicker.
This would be fantastic! I was going to add this as an idea and was happy to have it already in the system. We often manually create lists based on a variety of factors that wouldn't be effectively "query" and this would be a game-changer in terms of time and efficiency.