Most of the issues you describe (random voting, repeated voting, etc) are things that will be fixed given more time, and even now they are much better than they used to be. Disabling voting on some images is not an option as voting is necessary to get additional information like tagging and general categorising about an image, and without that they would just end up orphaned on our server. This has been covered in better detail in past posts in this forum but I'm too lazy to dig them up/type them out right now

Basically more votes solves the problem, but there will always be
WIP and boring images slipping into the voting and ruining the fun for some people. I have a few plans to improve it and they will come into play in the future.
Skip an image missing the next image preference stuff is a bug and duly noted thanks. I'll look into getting the turbovoter to accept number pad input as I thought it did already.
Glad you like it though and thanks for the votes you have given so far!