Thanks alot for the reply!
However, that line already a hashtag before it. Listed as :
Forces cropping of overscanned frames.
Exact behavior of this option is implementation specific.
video_crop_overscan = true
in opt/retropie/configs/all/retroarch.cfg upon opening file.
Edit: Hashtags in my .cfg file are not listed when copy, pasted here. I will link my .cfg via pastebin.
http://pastebin.com/CsuS0qVR
Edit #2: I was able to disable overscan for Fceumm nes emulator via editing /opt/retropie/configs/all/retroarch-video-modes.cfg and changing the command
"fceumm_overscan = enabled"
to
"fceumm_overscan = disabled"
I am not sure if this is a detrimental option, but it has solved my problem thus far.