Evaluates the pages Acronyms+ and Abbreviations+ to read a
definition list or table from them, whose entries will later be
replaced in the whole wiki. Then all occourences of those
abbreviations or acronyms will be replaced by the accoring entitled
html tags (<abbr> and <acronym>), providing a lot user-visible meta
information easily.

You could style thouse occourences via CSS as usual.
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You cannot modify the README.plugins file, but anyhow any ideas or suggestion should as usually get filed on BugReports, UserSuggestions or even better the README.plugins.Discussion.