is this what helped you:

I think Millar is going to take this whole Thor drama and deliver us what we all want: Ultimate Loki. That's the only thing that it could POSSIBLY be! And when Millar lets him loose, it's going to be bigger than the last volume.

I like (actually, not really) how Thor took out Quicksilver. You know #5 is going to be full of action, and we will see what Thor can REALLY do. All of the flyers are gone, remember last volume where Thor takes down the Skrull ships?

I think there will be some heavy monologue next issue though, Thor explaining it while they are in Asgard, or something along those lines.

When hasn't he been able to combine powers?

Super Skrull pictures on Google

Why doesn't he use all his powers all the time? Maybe it's hard to concentrate on more than one at a time.

[I'd think that a rocky hand and long arm would be rather simple for a shapeshifter. Not even a power, really.]