It is really annoying to have to specify the path because it changes based on which program generated the stacktrace, so you can't just use a single command like xclip -o | mongosymb.py and need to use different commands depending on the binary. This makes it harder to integrate with IDEs and other tooling.

On linux we can get the path via reading the symlink at /proc/self/exe. Here is a stackoverflow answer with the API for a bunch of other OSes, but just doing this for linux would be a significant win.