MacOS – How to limit the bandwidth on a per-application (or per-process) basis in OS X Yosemite

This can be done, but you cannot hide just the dock per app. It will hide both the Dock and the Menu bar per app.

You just have to make a quick, simple edit to the plist file for the application. Check out this article from Mac OS X Hints:

To hack an app so that when it's active, the menubar and dock are hidden, you need to find its info.plist file. Control-click on the program in question, choose Show Package Contents from the pop-up menu, and then navigate into the Contents folder.

Once there, add the following to the file:

<key>LSUIPresentationMode</key>
<integer>4</integer>

Be sure that it goes in alphabetical order, otherwise it won't work (i.e. LSUIPresentationMode goes after LSMinimumSystemVersion but before NSAppleScriptEnabled). Save the file and enjoy.

You can change the value (in the example, it is 4) to 0 - 4. Apple's documentation has more details:

Value: 0

Normal mode. In this mode, all standard system UI elements are visible. This is the default value.

Value: 1

Content suppressed mode. In this mode, system UI elements in the content area of the screen are hidden. UI elements may show themselves automatically in response to mouse movements or other user activity. For example, the Dock may show itself when the mouse moves into the Dock’s auto-show region.

Value: 2

Content hidden mode. In this mode, system UI elements in the content area of the screen are hidden and do not automatically show themselves in response to mouse movements or user activity.

Value: 3

All hidden mode. In this mode, all UI elements are hidden, including the menu bar. Elements do not automatically show themselves in response to mouse movements or user activity.

Value: 4

All suppressed mode. In this mode, all UI elements are hidden, including the menu bar. UI elements may show themselves automatically in response to mouse movements or other user activity. This option is available only in Mac OS X 10.3 and later.

The short answer to your question is 'it depends on the app'. This thread in the Apple Discussions Forums implies that, at least for basic apps that do not have complex connections with the system, it is possible to restore via Time Machine.

If I am not mistaken, Time Machine works the same way in all folders (including Library and Applications) as long as they are not listed as an exception in System Preferences. What this means is that if you open a new Finder window showing the user's Library folder and then call Time Machine, that should bring back the preferences subfolder for your app when you "go back in time" to when you had it installed. Naturally, you would have to know in advance the name and location of the app's preferences folder within your user's Library folder.

After that is done, then opening Time Machine in a Finder window showing the Applications folder should bring back your app if you "go back in time" to when you had it installed. It's a two step process, but I don't see why it would not work at least for simple apps.