Recently I played osu and had an accuracy of 91% when I was almost at the end of the song, but I didnt know wheter I should continue playing for an "A" or just start over. I think you did that sometime too 
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Now I can imagine a second bar right under the accuracy to show you, what maximal score/accuracy you can get from where you are playing.
What do you think ? Can you imagine something like that? Because then you wont be dissapointed after almost aiming all circles except the three in the middle and then seeing an A
Total possible accuracy bar:
Number of 50s * 50 + Number of 100s * 100 + Number of 300s * 300 / (Number of misses + Number of 50's + Number of 100's + Number of 300's * 300)
. Now I can imagine a second bar right under the accuracy to show you, what maximal score/accuracy you can get from where you are playing.
What do you think ? Can you imagine something like that? Because then you wont be dissapointed after almost aiming all circles except the three in the middle and then seeing an A
Total possible accuracy bar:
Number of 50s * 50 + Number of 100s * 100 + Number of 300s * 300 / (Number of misses + Number of 50's + Number of 100's + Number of 300's * 300)