Really wish we had access to the outside world from within PixInsight. The scripting language is very weak, and intentionally restrictive, since it comes from the land of web programming. (You don't want web pages to execute arbitrary code. But we are scientists in charge of our own destiny here.
If not a full-blown FLI, as found in ML, Haskell, or Lisp, then at least a (scriptable) way to reach outside executables.