hay mate. with regards to the rear shock i believe the nut your trying to adjust is your pre-load nut. if im not mistaken its the nut thats in direct contact with the spring yes??? if this is true all this will do is stiffen the rear shock for a harder ride. this in some cases can be good if your getting alot of air and need some more take in your shock. the thing with these shocks is the length (270mm, 280mm etc...) is a fixed size and thus cant be changed, only preload is adjustable so unfortunatly unless you make a form of bracket for the swingarm or the frame to extend the distance from shock to bolt holes in some fashion unfortunatly your stuck to that certain size.
personally my motor is a GPX and the oil that came with it was of a good quality to run in, if you feel the need, you can change the oil but make sure its a mineral oil to run in on, their your only boundaries for your oil and run in period. after this go with motul 5100 as i have found its one of the better oils to use in these bikes. the stock oil isnt of the best grade but it also will do the job it needs to do, dont forget its only supposed to be in there for 1 - 2 tanks of fuel so i wouldnt be too worried about it.
the throttle play is the ammount you can turn the throttle freely without effecting the actual throttle (if that makes sence) there is a certain ammount of slack in the beginning where you should be able to turn your throttle without effecting the revs of the bike, this is what the manual is refering to. personally i only have like 4mm of play in my throttle as i like to be able to feel the response at slight touch from take off.
as another member here said, let off the throttle, change gear and the back on the hammer, will keep the gear transitions nice and smooth and preserve the life of your semi auto clutch
hope this all helps mate.
Cheers, Tony.