Can you access the file dialog with out waiting forever with just the spinning disk showing?
Well... I can now, but I did have to install an SSD to make that happen. It didn't happen very much though, and forever was normally less than a few seconds.
Does the filesystem update when things like screenshots are taken with out having to force a reload of the filesystem cache
Yes it does. Perhaps you have a hardware issue on the disk? Might explain your spinning wheel on file open dialogs too.
Can you lock the dock to a certain position on one screen?
Such as where? Left, bottom or right. That's about it.
Can we have it so the HDMI Port stops cutting out?
Yes, if your hardware isn't broken or marginal. I suggest a trip to the store if you're having that problem.
Can the screen properly update without black boxes sometimes covering content / UI elements
Yes. Sounds more and more like some hardware issues..
Can we have an OS that doesn't feel like it is from the early 90s
In the early 90's we had Windows 3.1 - I remember that pretty well, and it didn't feel much like OSX.
Can we have more graphical setup options instead of having to do things through the command prompt
No. Which is slightly annoying I suppose, but I do find I spend less time fiddling with it and more time getting work done.