Issue activating MF on EM5 using 75-300 and multi-function

Most of the time when I need manual focus to tweek the AF setting I'm out towards the long end of the zoom range shooting through obstructions and find it relatively easy to get it right manually using the E-M5 EVF without having to use the focus assist magnification so I do enable S-AF+MF to get at MF with no pressing needed. Otherwise, I also have the FN-1 key set to toggle between AF and MF.

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"There's shadows in life, baby.." Jack Horner- Boogie Nights