It occurs to me that pretty much everything in the "Now Playing" area can be clicked on except the song title.

To an extent this makes sense since if you click on an Artist or Album name it simply searches for that artist or album, and really for a song title you aren't going to have a lot of exact matches.

So how about this idea... if you click on a song title in "Now Playing" it searches for SIMILARLY named songs, but not necessarily exact. You can arrange some loose rules. Let's say:
title is 1 word - exact matches only
title is 2 words - one word the same, excluding common words like an/the/a
title is 3 words - two words the same excluding common words like an/the/a
title is 4 words - two words the same excluding common words like an/the/a
title is 5 words - three words the same excluding common words like an/the/a
title is more than 5 words - three words the same excluding common words like an/the/a

For example, let's say you are playing "Rock & Roll Lifestyle" (3 words if you don't count the "&" symbol) by Cake. If you clicked on the title it could search for anything including at least 2 of the 3 words in the title.

Why would someone want this? Well I think it's kind of a cool way to search for songs on the same theme as what you are playing, and that might appeal to the people using eJ in "party mode". Plus, it would also cover quick reference of the same song covered by different artists, without having to use the full-blown search interface.