What is the IntelliJ IDEA's Keymap's abbreviation feature useful for?

What is the "Abbreviation" feature in IntelliJ IDEA Keymap for? Web help on Keymap is silent about it.

IntelliJ Keymap abbreviation screenshot

According to Andrey Dernov from JetBrains Support:

You use abbreviation added in keymap for quick search an action when "Search everywhere" (double Shift).

After adding "foobar" abbreviation to Git annotation command.

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I can find the abbreviation and invoke the command with double Shift.

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Unfortunately, the functionality does not support partial entry.

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I personally find Shift-⌘-A easier to use in that case, because the results are limited to commands only.

PS: JetBrains support rocks!

Update: There was a follow-up from JetBrains:

The feature was recently added in IDEA, we haven't had time to update the documentation yet. We will do it in near future.

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