What are common non-lexical indicators of sarcasm expressed orally in English

You pretty much summarised the main linguistic indicators of things like sarcasm or irony:

• intonation
• pause
• stress
• emphasis or volume of voice

But there are also many paralinguistic signals such as:

• gestures
• facial expressions
• symbols (in writing) such as emoticons, quotation marks, italics, etc.

However, often sarcasm is not overly indicated. The things that are used to disambiguate include:

• context
• situational knowledge
• speaker negotiation (the extreme being holding a sarcasm sign as in Big Bang Theory)