Pretty sure the text and button can't be moved.
Ah, that's a bummer. I was hoping they could just as the icon/text in the address bar can be. Thanks for the info. It saves me time which would have been wasted experimenting and searching.
The black square is probably because Address, Breadcrumb, & Search > Search > SearchBox > Basic > Normal > Active > Background > Focused ( or Address, Breadcrumb, & Search > Search > SearchBox > Basic > Normal > Active > Background > <4> in default VSB XMLs) has to be a solid color. You probably have transparency where you cut the angle.
Yes, that's correct. It is transparent where I cut it (all 4 of them are cut this way to maintain the shape of it). Given the info you provided I modified the shape of the 'Focused' entry so that while the others retain their shape, this one is rectangular so that it simply changes shape when focused rather than looking strange (no more black box outside the boundaries of the box itself).