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Like trigger said actually it is possible (at least with the anti-spam plugins).
In the anti-spam plugin list (options->preferences->protection->antispam) you can right click on a plugin and you have a menu with the “Information” item which is a sort of About.
This about is also available if you go into options->preferences->plug-ins (last item in the tree); from there you can see a list of available plugins, you can select one and click on the information button and the about window comes up.
Actually I use BayesIt! plugin and avast! plugin, BayesIt comes up in the global plugin window but avast! doesn’t, I don’t know if TheBat’s Plugin API makes a difference between AV plugins and Anti-Spam plugins, you should ask the devs. I don’t think it is correct if TB’s API have this limitations on AV plugins.
The same applies to exporting macros.
Anyway the devs could help you on this one, if they don’t let me know and we could use TBDEV mailing-list. 
Keep up the good job.