Fix for some hotkey modifiers not being recognized

I'm not sure what causes this, but I had a couple of workflows that didn't use any of the recognized 'hotmod' values. They were fairly old workflows, so perhaps the hotmod values have changed since then. I've added a couple of the 'hotmod' values to the code, and added an error message in the markdown where the hotkey would otherwise have been listed.

Here's a preview of the error message:

![qlmanage](https://f.cloud.github.com/assets/375202/321377/fb31e796-99c2-11e2-9b4f-e8005e59955d.png)