Well first let me say welcome to the new guys.

Now to reply to some of the new suggestions:

Green lasers: Although it would have made sense for the At-At's to fire green lasers to match the rest of the imperial craft The green wouldn't have looked too good against the blue skies. Plus the AT-ST's in Jedi fire red too and i wouldn't be able to substitute them for green lasers in that due to the green woodland surroundings, so they will remain red

The Asteroid Flash: This one has never bothered me and i don't think it needs to be changed. a small rock hits it at the beginning of the shot and as we see a few asteroids colliding and exploding this really doesn't need removing. After all it is a fantasy film. :)

Snowspeeder engines: Again no need to add any form of glow to the engines as it is a speeder and non of the speeders have any form of engine glow in the saga (apart from the new SE footage of the entrance to Mos Eisley where they added a blue flame coming from the engines but not to any of the other shots of the speeder. Another ILM cock-up). The exhausts we see are probably more like jet engines just to propel the craft forward. Only the Space vehicles really need the glowing engines.

Asteroid Easter eggs (show & potato): I love these types of things they add into the movie so there's no way i would remove anything like this. They're really just a fun thing and not a mistake and also doesn't stand out, so you wouldn't even see them unless you know where they are. Also i thought that it was only a potato added to the asteroid field and the trainer was added to the background ships at Mos espa in TPM

Anyway i'm still just over £30 from getting the power suply so won't be starting work again yet, but hopefully very soon :)