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Changing critical values?

Hey there, just wondering if anyone knows how to do the following: I'm trying to change a player's character sheet to have a critical success when he rolls attacks or saving throws and the result is a 9, and a critical failure on a 12 (in addition to their normal values of 1 and 20). Is there any way to feasibly do that? 
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GiGs
Pro
Sheet Author
API Scripter
You can use the cs and cf notation /roll 1d20cs9cs20cf1cf12