implemented in 23.1 RC 1

Can already be done in the preferences by editing the corresponding tool.

We are using ANTLR for configuring the lexer grammar. Better suggest which language is missing as a separate request.

Swift should be supported in the meantime. Let me know if there is something incorrectly lexed.

Verilog is available; let me know if there is something incorrectly lexed.

At the moment, middle-click closes the tab.

Let me know if you can reproduce the problem with any easy to install Linux available as .iso file and capable of running in VirtualBox.

Clicking on the window title to close is subject to the operating system/window manager.

You can modify the commands yourself.

Next 23.1 preview build 20117 will contain this feature.