RTL lines

[Alexandre Garreau]

Is there a var to make any line whose first either rtl or ltr char is RTL 
be displayed RTL (so for instance an org-mode definition list (with ::) 
would be displayed RTL with the bullets at right, if the defining terms (at 
the beginning, just after the */+/-/etc.) are in arabic/hebrew/etc.)?

Another idea I have is is there a way to do that per-paragraph (for 
instance for a defun that would use a such language)?

and arbitrarily (for direction-agnostic languages such as some extreme-
oriental ones)?

and does emacs support TTB/BTT (top to bottom, bottom to top), because I 
feel that would be a better use of human peripheral vision and physical 
ergonomical limit of line-length?