I'd like to emphasize curly brackets, e.g., put them in bold font or give them a different (foreground/background) color. I don't see an option for this in the Syntax Highlighting menu in the configuration window. Is this somehow possible?
This is not possible, at least not permanently. However, there is brace matching, i.e. highlighting of the corresponding brackets if you place the cursor next to a bracket. This highlighting is configurable at LaTeX checking -> braceMatching.
LaTeX checking -> braceMatching