That was already discussed and could cause really much confusion for new users, also it would be a bit difficult on how to implement that in the CA App since you need more different templates, the paths can be different, the ports,...
I think also another reason was how many Cluster templates that you put on the CA App, 1, 2, 3,..., 11,...
Creating a cluster is nothing for beginners and if a beginner uses the wrong template from the CA App or thinks that something like this is easy to setup I also have to give support for. That's why it was decided to recommend the post and not put it on the CA App.
Yes I know, but keep in mind Modding is not a Mod.
Modding means for me any modification to the server what is done by the user, that also includes that more servers/containers act as one server.