1 - THe majority of Necrons can turbo-boost, yes. Wraiths, destroyers, heavy destroyers, scarabs can, and there may be more, but i'm not sure. Warriors definitely can't, but bear in mind that turbo boost in general will get necrons closer, which in most cases they don't want to be - they can work fine at medium range.
2 - The marines can use the commander's leadership all the time as long as the commander is still alive. I'm not sure if this extends to things like the animus speculum though, or just for morale and pinning tests - i'd have to look that up. But yes, as long as he is alive, all the marines can use his lovely high leadership for all their tests.
LoC
2 - The marines can use the commander's leadership all the time as long as the commander is still alive. I'm not sure if this extends to things like the animus speculum though, or just for morale and pinning tests - i'd have to look that up. But yes, as long as he is alive, all the marines can use his lovely high leadership for all their tests.
LoC