help needed

I Have 2 Questions Hope To Get Help With,
1) I've Translated The  v.71 Forum To Arabic Languge, But When Soomeone Post A Replay The Default font is on the size 2 wich is so much small when you type with it in arabic , so the user have to resize it to a bigger size , My Qusetion is : How Or Where to Change  the standered or default font to wich you start posting with .

2) When people first register the (Enable the Windows IE 5 + WYSIWYG post editor)'s Choice on "NO" I wanted to be on "yes" because users doesn't look to it usually , & then they start asking why I have a dialog box every time I change or edit my post

For No.2 I've changed to True & working fine now ,

But for Q No.1 ,
The Posting default font is not there to be changed ,