Two weeks ago we got a feature request from Ilya Malanin. What a great idea!
Our dev team implemented it right away and we hope you enjoy your new coding comfort:

Postfix Code Block Auto Completion is available for expressions:
PostfixCodeBlockAutocompletion

The expression will be surrounded by a new code block. There is a shortcut for all basic control structures expecting an expression.

The switch for Postfix Code Block Auto Completion is inside the Code Assist Preferences Page:
PrefixCodeBlockAutocompletionSwitch

A small demo of the application of two Postfix Code Block Auto Completions:
animation

Now for all control structures expecting a value Code Block Quick Assists are available, too:
CodeBlockQuickAssist