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I've done many ROMs recently and not had to touch anything low-level and essential like init.d.

If a ROM includes a kernel that supports init.d scripts, then it will overwrite any existing instance with its own contents.

Unless you know exactly what you're doing, it's best to leave init.d well alone. Back in my Galaxy S2 days I spent many an hour testing and tweaking scripts to optimise the performance for my needs. I know what can happen if you make even a minor error. :(
 
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