Hi all,
Just to note that the title field does support UTF8, so special characters are allowed; UTF-8 includes many super and subscript characters; Google “UTF-8 superscript generator” to find web-based tools to generate these, which can be copy/pasted into title fields.
This is not a complete solution, as some journals will want more complete HTML and/or MathJAX support in title fields, which is what Patricia referred to above.
You may be able to support MathJAX in titles (and other fields) by using the custom header plugin to include the MathJAX javascript in your journal website. However, note that MathJAX-style scripts in title fields will be passed verbatim to downstream services like CrossRef and Google Scholar, which might not know what to do with them.
Regards,
Alec Smecher
Public Knowledge Project Team