Great question. Yes, we have a way to disable jit. See the merged pull request by our super cool dev here: <a href="https:&#x2F;&#x2F;github.com&#x2F;Microsoft&#x2F;ChakraCore&#x2F;pull&#x2F;4" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;Microsoft&#x2F;ChakraCore&#x2F;pull&#x2F;4</a>. We have build configuration which produces daily builds without JIT as well: 
<a href="https:&#x2F;&#x2F;github.com&#x2F;Microsoft&#x2F;ChakraCore&#x2F;pull&#x2F;42" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;Microsoft&#x2F;ChakraCore&#x2F;pull&#x2F;42</a>.