Caveats & Discoveries
The following has been found to hold true for the JavaScript Patch in Quartz Composer.
If all you really need is outputs[0] = inputs [0] + 1 then you would be better served by a math expression patch - honestly.
Do not try to edit a script whilst rendering is in progress within the edited composition. Will result in a hang.
Do apply a random or patch time to the JavaScript's timebase, otherwise it will likely as not stop refreshing inputs.
There is a maximum amount of code you can run in any one JavaScript patch. The workaround to this is to compartmentalise one's code if possible.
Under certain conditions, you can find yourself working unintentionally in Native Code when using the JavaScript Patch.
Wish List
Screen Grabs
Notes