keyboard shortcuts for villager builds

[_eRaNu_]

I'm using HD keys, and when I want to build an economic or military building, I have to type "a" first before entering the shortcut for the building e.g. "e" for lumber camp. Is there a way to configure the shortcuts to avoid the initial "a" (or "s" for military buildings)? I'd like to configure just 'f' for farms.