keepout zones for router

Is there an efficient way to add keepout zones to avoid double soldering components eg.  IC sockets or elect. caps  where the pins are only accessible on the bottom coper.. I am trying using top copper shapes (later deleted) for double sided but non-through hole plated boards . This forces the router to via to the bottom if needed. But it feels like there ought to be a better way. I only do one off 'hobby' boards.

I expect this might have been asked before but looks like there is no real back content available still on the forum.

Thanks for any advice.  

Steve (design spark novice ! )