I am confident in saying that if any new features were to be added to existing engines, they would be shared across the products for those that support said engine 
Take note that this is a request specifically for the ACD engine, working sort of like an Insert FX. However, with the Synth, the Reverb/Delay/Mod work more like Send FX. If you were looking for something similar for the Synth, then that would need to be a new Feature Request as it quite a different implementation, development-wise.