Can you make an option to flag a cell as "might be a bomb/likely safe"? On levels where there are a bunch of possibilities for the last bomb or two, it can really help to lay out what possible combinations there are. Laying down actual flags means that if you forget which cells you were deciding between, you have to re-follow the logic to find out which cells you were deciding between. Maybe shift-click to add grayed out "OK" or mine flags.
 "Idle Sword 2"){kind=icon}
 "Mine of Sight"){kind=icon}