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This will probably sort your RTL Arabic issues:
Arabic RTL Fix - Now with T9 dialer and BROWSER!!!!!!!!
Not sure about Arabic text, but you can use LorDmod's UE kernel for MIUI. Just make sure you choose the BFS version, not CFS.
MIUI users - maybe it's better to use CFS version, and remove libsqlite.so that is located in /system/lib/ of kernel.zip file before flashing!!!
I use MrGarak's MIUI as it comes with LordMod
LordMod is recommended as CFS only, on MIUI

Can u send me a link to it? Actually the battery life on 1.8.5 does not look very attractive. I have got 9% left after a full charge about 11 hours ago and I'm on the stock kernel with 1.8.5. How can I make it better? Does this kernel you have mentioned do any good to the battery life?
1.8.12 has been released now, here is the link...
[ROM] MIUI 1.8.12 v.1: Freshly Squeezed Edition 12/08/11 - xda-developers