custom font colouring in RStudio

When writing code in RStudio, it conveniently applies colour coding to help to the user understand which bits of text are what.
For example, reserved words (function, if, etc...) are coloured differently as are strings and numbers. These colour codings are different for different file types, for example in RMarkdown, latex commands are stylised, as are emphasised text.

Is there any way to personalise/edit which bits of text get different formats. I have started to use Critic Markup to track changes in my RMarkdown documents and it would be useful if I could tell RStudio to highlight the {++ ++} bits (as well as the others).

Unfortunately, no -- this is not currently possible. Would you mind filing this as a feature request at

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