LOL well as I was pondering similar questions, here is what I think.
Hiro told Ando he was no longer going to travel back and mess up the space time continuum. That is why he let his dad die, he came to the realization what he was doing in that episode.
Peter going back in time, well I don't think peter knows how to control the back in time power since he said he left a girl in the future and didn't know how to go back.
Syler has gotten "close" to Maya so he could take a chance in making Maya angry so she could do whatever it is she does but by almost killing him forcing her to control her power. I think it was only a matter of time before she was able to control her power.
The Copy Cat chick, yeah I totally agree with this one and was thinking the same thing. Why didn't Mica touch the light pole and call the cops or something. Im sure his power doesn't work that way but maybe it does.
Who do you think is going to die? I'm thinking Nikki and Maya are going to bite the bullet. Or maybe that stupid flying guy. It pisses me off that they are bringing in Hero's with stupid powers or powers that someone already has.