Cannot assign shortcut to custom search engines, and cannot customize list of default search engines

[henhal]

Great tool, however, two improvement suggestions:

• I'ts impossible to assign a keyboard shortcut to custom added search engines - only the static default 4 engines like Baidu show up in the shortcut assignment settings
• I don't need the default search engines like Baidu etc - I only want my own one which is actually "search code in my organization on github". An option to delete the default search engines would be nice

If it would be possible to get rid of the default engines and only add my own, and also attach a keyboard shortcut to it, this would be super awesome!