When you move the config button to the top that button itself blocks the options button and is almost impossible to click it. Also noticed that when changing the block button to display on mouse over it doesn't work and he button does not appear anymore and changing it back to always doesn't restore it either.
I also noticed that this script seem to mess up with the search result box which causes for some styles like the one you showed me that creates columns on duckduck to generate graphical issues that are not caused by the space the button uses but by other stuff you seem to have changed about the css. Like it seem to mess witht he size and limits of the box. Results that have long tittles will go outside of the designated "result box" and results with long descriptions would occupy more vertical space. Could you check on that?
Thanks for your time for creating this script and maintaining it.