Because Pages for iOS has bugs which make it largely unsuitable for writing Arabic/Hebrew, I have been looking at other word processor apps to see if they could do things correctly. e.g. a) start the sentence at the right side of the page, b) normal cursor behavior, and c) correct positioning of numbers, punctuation, and list headings -- while still having the the ability to produce rich text in various formats.
The best I have found so far is Textilus.
But I am not much of an expert at Arabic/Hebrew. If any readers know of shortcomings with Textilus or have other suggestions, please comment.