1:I disguise as scoot. ALOT. Because people are always like, "OH HE'S A SCOOT HE'S OF TO ATTEMPT TO CAP DA POINTS WE DUN'T HAVE! LET'S NOT SPAH CHECK HIM FOR SOME REASON!"(Either that or I'm just a lucky bastard.

2: Use the Dead Ringer to cross spam fests and get to cover. (no need to go into detail herrrr.)
3:Play like the class you're disguised as. For example, as soon as a round of King of the train starts I go straight to the enemy platform and backstab them all. (But usually end up getting run ovar by da train. D:) This is also giving my team a headstart on capping the point.
4:Don't go too far off on your own into enemy territory. Either have a friendly spy with you or just retreat back to your territory if you start taking damage if there aren't any health packs around/they're chasing you.
5: FEELINGS!?!??

6:Being efficient doesn't just apply to snipers. only stab the classes that will cause the most trouble to your team in this order:
A:Warmonger
B:Medics
C:Hoovies
D:Memodans
E:Soljas
F:Failros
G:Snipahs
H:Spahs
I:Scoots
J:Denganeers (If thier about to put something down stab em' then sap it. If they're just wandering around, stab them whenever.)
This helps me at least.