Yes I know that that chm is a compiled set of HTML files. But to edit them you need to decompile it, make your changes and then recompile it. Whereas with straight HTML, if you want to change or add something on a page all you need to do is right click/view source and make your changes and save.
As to 'why would anyone want to modify the manual?'
Well, if You don't see the need to do it then fine, leave things the way they are, thats why I suggested that it be user configurable.
As for me,
1) I liked being able to easily add things that aren't covered in the 'official' manual.
2) Or if something is covered but not in a way that makes sense to me then it was easy to change it so that it does.
3) I liked being able to put my own code snippets in the help file
4) I liked being able keep the orriginal helpfiles intact and add my own content through new pages and hyperlinking to them.
Above All
5) I liked that all the extra information I discovered via research was available to me (after editing the help files) via the F1 key. No trying to remember where I saved that piece of information on the harddrive. That's why we have help files, isn't it?
I don't know if anyone else feels the same way as I do, maybe i'm peculiar, but as I said in my orriginal post, it suits my workstyle and this is the place to make suggestions for new engine or editor features. I am just making a suggestion.