Unfortunately, we're just averse to adding even more options. Since googler's just a single file and pretty much in feature-freeze at the moment, it shouldn't be hard to maintain a "fork" and have it your way.
Fallback to tmux buffer without native clipboard
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Closes #230.
Just tested on an Ubuntu box without xsel. Should work.
Re tmux: it's not great, but sometimes it's the best you've got. I have 18 panes at the moment. Tmux control mode with a good terminal emulator that supports it (i.e., use your terminal emulator's native windowing, paning, etc.) really take most of the pain out of it.