Change application's execution parameter?

I'd like to always start Google Chrome in Incognito mode. In Ubuntu, I'd just modify the Chrome shortcut and append "--incognito" at the end. With Windows, I'd just append "-incognito" to the shortcut, and both of these solutions worked for these OSes...

Can someone tell me how to do this for the dock icon in Mountain Lion?

 

Anything within Chrome's preferences will only take place after Chrome starts. The problem is that it's going to start in the regular mode, and not Incognito. There's no way, from the preferences at least, to make Chrome start up in Incognito.

I think modifying the shortcut is absolutely necessary. Thanks for replying though.

 

Yep, I actually got this working doing the same thing you mentioned in the second step. Thanks for responding!