I'd like to suggest something regarding search. I think the amount of time between when something is entered and when the search takes place should be configurable. For example, if I type "tag:project" and want to continue typing to add "my great project", the search begins working before I stop typing and locks up the UI. I think that's likely what some have complained about regarding the search being "slow." It's not slow, but it starts searching too quickly. I'd like to be to adjust it. I think it shouldn't start searching until typing has stopped for about 1 second, but other users might want a shorter or longer amount of time. I'd suggest configuring the time amount in milliseconds.
Fantastic product. Love the update.