Arabic and Aspect and Tense

In a discussion on another blog, www.AncientHebrewPoetry.typepad.com , John Hobbins asked me about tense and aspect in Arabic, with an implicit question on its relevance to biblical Hebrew tense-aspect, "Does [Östen] Dahl represent a consensus point of view when he interprets the classical Arabic verbal system as at root aspectual? Or is there a continuing [...]