Is there any place we can ask for some changes?
Either here or there is an actual issue tracker on GitHub.
I would like to know if developers think to add features or if the “future” is just adding plugins.
Nobody is opposed to adding features as long as the majority of users will actually use it. It is very easy for a program to get bloated by tons of features only a few people will use. That’s why using a standalone plugin is nice because users can pick and choose what functionality they want. Also, the Notepad++ project does not add new features to Scintilla, it is just used as is. So if Scintilla doesn’t support a certain feature then Notepad++ won’t implement it.
I was searching for a way to copy/paste entire row when nothing is selected (I think is a Scintilla feature) and I found a plugin.
I also use a plugin to do this. It is not enabled by default within Notepad++.