There should be an option that allows you to tweak the universal offset for specific mods. This feature would nullify the need to always return to the options menu to change the universal offset, if I wanted to switch mods. For Instance, I normally play Hardrock with -20, Nomod with 0 and Doubletime with -35 Offset. The local offset would then only serve to tweak the offset for specific songs (inaccurate offset of unranked maps or generally maps that have a weird rhythm). I'm aware that not everybody plays osu! with an universal offset, but there is still a sizable amount of players that do and this would ease the navigation of osu! and thus lead to a more enjoyable experience all around.