As far as I know, that option in EAC isn't related to seamless/gapless playback. I wish it was- somebody needs to write a ripper that handles that stuff correctly.

No, I think what it means is this:

On albums where the songs begin and end with silence, do you want to automatically trim off the silence so that the songs begin and end with the first/last bit of wave data?

The purpose is to reduce the file size of the MP3 a tiny bit by not trying to store empty frames. It also makes the songs play "closer together", more like a radio DJ would play them.

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Tony Fabris