info: standalone simulator

collections/_docs/en/002-002-simulate.md

@@ -2,20 +2,32 @@
 title: "Simulate"
 permalink: /docs/simulate/
 excerpt: ""
-last_modified_at: 2018-07-27
-toc: false
+last_modified_at: 2018-09-16
+toc: true
 ---
 
 Select the objects you wish to see in a simulated preview. If you want to watch your whole design being simulated, select everything (`Ctrl+A`) or nothing.
 
 Then  run `Extensions > Ink/Stitch > English > Simulate` and enjoy.
 
-### Simulation Shortcut Keys
+## Simulation Shortcut Keys
 
 Shortcut Keys | Effect
 -------- | --------
+**→** | play forward
+**←** | play backward
 **↑** | speed up
 **↓** | slow down
-**r** | restart animation
+**+** | one frame forward
+**-** | one frame backward
 **p** | pause animation
+**r** | restart animation
 **q** | close
+
+## Run Simulator Independently
+
+Run the simulator by itself on any supported embroidery file:
+
+```
+PYTHONPATH=/usr/share/inkscape/extensions python -m lib.simulator path/to/myfile.ext
+```