I really like speed dial but it's a pain that you cant open several sites from 'right click' open in new tab.

Actually, you can. To a certain extend anyway. You can open several sites at once if you use folders in your speed dial to group some sites together (if you click on such a folder then a pop-up opens which shows all contained websites).

As said; normally a folder opens when you click on it to show you all contained websites. But if you right click on the folder and then use "Open all" you'll get the result which I think you're after: all sites will now open at once, each in its own tab.

Hope this can help.