this game is quite fun to play casually..
Plant charges and wait for cars to drive past..then detonate..
and best of all, cars loaded with players kept going through the same road in hotwire..

this is more like a mini scale warfare, rather than big scale tank n planes.
One thing i like though, no one can dominate over others with tanks, unlike BF4 where if you have a big tank and 2 repair guy repairing your tank..you're basically invincible.

i suppose the C4 u're looking for is at Enforcer - breaching charges.
the sabotage is for cars, mainly hotwire where you put it on every car you walk past, hoping that enemy will drive the car away and it will automatically explodes.