Module support?

I think HMVC is perfect for codeigniter.

1: When you create modules you can work on one while developer works on another.
2: If creating online shop HMVC is good for widgets. Like what open cart has but open cart is oop I think.

But also be able to have the option to enable or disable HMVC in config that way if users do not want to use it then can turn it off.

The other thing I would like is for the router in default controller to be able to handle sub folders.

This only able to do with HMVC
$route['default_controller'] = 'catalog/common/welcome/index';

I use to be able to use subfolders in default controller in codeigniter 2 + but they seem to have removed that feature in codeigniter 3

There's only one rule - please don't tell anyone to go and read the manual.  Sometimes the manual just SUCKS!