Hello (new maintainer here), I had a look at this and it seems quite innocuous to enable it. Removing --disable-debugger in debian/rules enables a '-d' switch that traps to the debugger. I'll test it more and include in the next version.
A WIP version can be found on git://github.com/emillon/zsnes.git branch "debugger". Cheers, -- Etienne Millon
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