Yes.This suggestion has quite a lot of uses. for example: someone makes a logo with wifi. He then makes an electronics save. He then pastes his logo on the save. The wifi channels of the logo and save may conflict, and he will have to change some wifi channels, which is booooring. or worse, the save uses most of the available wifi channels and the user will be forced to publish without a logo or make another logo without wifi, which is again boooooooooooooooooring. But if this wifi blocker wall is there, just draw over the logo with the wall and there you go. Also this is perhaps the only way to have multiple electrodes in a save and yet spark the electrodes individually without melting parts of the save.
this would be a lot harder to implement than it sounds (see gravity wall for example, the zones inside and outside are not actually separate, it's just that gravity doesn't work at all inside), but it is possible. It might allow for having more wifi channels, without actually having more wifi channels, making it useful. I don't see myself adding it soon (too busy), but maybe if someone reminds me much later I can try looking at how gravity wall works, and using something like that to make this.