Hi – did check your site with IE8 and I notice couple of issues you mention on lower resolution monitors when the browser width is decreased. When the browser window size is increased, things look ok.
As far as horizontal scrolling is concerned, I would not worry about it if the page is rendered fine since it happens only when the browser is resized below 1140px and IE8 market share is pretty low these days. Again, we cannot make the template responsive on IE8. Will get these fixed by early next week (should be couple of minor CSS that you need to input into ie8.css file).
You can always email me through my ThemeForest profile page http://themeforest.net/user/livemesh (bottom right box). Thank you for working with me on these and I appreciate all your time.