Since the flip side is the default dead key , I am struggling with the same problem.
Living template
Currently, I have created a live template called -- (double-dash) to quickly create a subscript line. Below you can find the settings that I used for the template:
Abbreviation: --
Description: Backticks
Template text:
`$0$`$END$
Apply: JavaScript
Unfortunately, PHPStorm / Webstorm does not provide a way to switch the quote style. Like case toggler (Edit -> Toggle Case)
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