I think it would be a really nice thing to be able to create simple tables in questions and answers. You would do it like this:
[table title="My Table1" orient="vertical" col="column1,column2,column3,column4"] [row num="1" data="item1,item2,item3,item4"] [row num="2" data="item5,item6,item7,item8"] [/table]
But rather than type that all by hand, the format buttons (bold, italic, etc.) would contain a drop-down menu, "Create a Table" and be similar to the one in Microsoft Word 2007+. A table editor could also pop up in the same type of box as "Flag this Question" is.
If the dimensions are too great to display on the page, the upper-left-most corner is displayed, and then the column at the right is titled "(...)" and same with the bottom row. Clicking those would either scroll one window-width down/right via jQuery, or just open a pop-up window with scrollbars.