Well first of all im glad i could help ya. About your questions: Nah, the afination isnt G major, just play it E standard, my tab is meant to be played E standard afination as a matter of fact. Well as i said, the non guitar cool part aint even guitar at all so you dont need any kinda pedal to play it, you can just play it on whatever amp ur currently using and it will work just fine. Bout ur third question, the "non guitar cool part" is the intersection between the first guitar parts of the song and the chorus, to be more precise, it goes from 0:33 to 0:47, then the chorus kicks in, and the chorus would start off at 0:48, and stop at 1:16.
By the way, if you really want a wah wah effect when you play, or almost any effect ever created you could buy an audio interface then use guitar rig or some other guitar software, dad bought me mine, it arrived like 4 days ago and all i can say is: It just sounds so much better than the amp i had. It even has the wah wah pedal you so long for .