Setting to control number of context lines when in compact diff mode

It would be really helpful if we could manually control how many context lines are shown when using Compact diff mode. I believe right now it displays 3 lines above and below the chunk, but this is often not enough to quickly know where in the code the diff is, especially if 1 of those 3 lines is a blank line. 

I often find myself clicking the "Show Hidden Lines", which is cumbersome when I'm doing it for every chunk, or switching off Compact mode.