This deal may be great, it may be bad. But please, do think about the implications of giving someone ability to modify codes, and the malicious things they could do.
While the integrity the of the code and letting malicious content into the source is always a concern, and you are quite rightly worried about it, there are generic software engineering methods/practices such as code review and testing at different levels just to mention a few unit test, integration test and system test to ensure the application meets the requirements and it does what it is intended to do. As long as generic software engineering practices in place the malicious code should never be part of the release. There are experienced developers in this project (at least their CV implies that), they should be able to ensure the integrity of the code.
Ah, thank you for that clarity. Appreciate you mentioning that. Having only heard of this happening to other coins, I wasn't aware that such a solution was available.