2
Hello.
Question 1 : multiMenu is not properly a content module, as it does only have modules. That's why you can't apply wide range cache.
Question 2 : I have been reported that problem. The fact is that each and every generated blocs are reporting to the same template. Which means, I think, that if you cache that template, you freez its content in the mean time. The simpliest way to solve that problem is to creat a template for each bloc.