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OK, I think I see what you are saying. I think I was assuming too much this is like the 'multilingual content hack' thread. i.e. I thought you wanted to enter the content of e.g. a news article in multiple languages using the square bracket notation described in that hack. The reason for the language tag is so that only *one* version is shown when someone visits the site. The tag is the only practical way for XOOPS to know which part is to be shown to users who have selected each language. Because you would specify the language, there is no reason it could not automatically know whether that language is RTL or LTR.
What I *think* you mean is that you would enter the post content in one langauge e.g. Farsi, and you want to force this to be RTL with the [rtl] tag. You would never actually indicate this is in Farsi other than the specific characters you had entered... The purpose would be to always show this text as RTL regardless of the "main" langauge of navigation etc. for the site. Is this a correct interpretation of what you mean? If so, I can understand your desire to have RTL.
However, I think XOOPS will eventually have in the core some support for multilingual *content* and as you seem to agree, the rtl/ltr tags would be redundant. I think a lot more discussion is needed on how best to improve the multilingual capabilities of xoops.