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It depends upon the module as to whether or not you can do something like this. On these forums, no; on others yes. It depends upon what the module developer allowed. Some dis/allow XOOPS Codes and/or HTML. However, you either turn on XOOPS codes or off, same as HTML. If HTML is allowed, then you can likely do what you want. Unfortuately, what you are asking for isn't available, but you're right, it would be good. XOOPS Codes (BBCode as I've been reminded) is the "safe" alternative to using/allowing HTML. Having a way to disable them as you've suggested is a good idea for developer type forums.