There is now better way of adding shortcuts directly from the launcher, through the "widgets" menu.
Oh, cool.
Wouldn't be sensible to make a start/stop icon in one and that it just changes the icon when it started/stopped?
(unrelated: I tried writing my own server now and a bug I reported earlier, regarding not sending the position while having GPS disabled, is not present. it works normally with GPS off using just network location, but I haven't tested on the official Traccar server again.)
Unfortunately it's not possible to make a shortcut that changes icon, as far as I know.
I've updated to the latest version of the client on Android (4.1.2) and I can't find anymore the "Add Shortcuts" option. :(