Thanks for your test. As I said this is a very early test.
Anyway, I'll try to fix that group bug. Funnily it used to work yesterday, and not today.
I must have changed something which didn't pleased to... er... it.
Regarding your questions :
1) This is for Extended option, or more simple, default options when you create a new edito. If you uncheck it, for instance, any new edito would have this option unchecked as well. Thus, it has no direct influence on the previously created editos, nore on the module display settings.
2) Exactly. This option concerns the edito page, and not the index page. Maybe we could decide otherwise, and have a general setting to define whether we want index to display the logo or not? Actually, the 'logo max. width' set to '0' solves this.
So to summary, logo display works like this :
1) Block: in the admin setting, you can choose to show the logo or not.
2) Index page: Unless your logo is blank
OR you set logo max width to '0', the logo would display.
3) Edito: you can check the corresponding box if you want or not to display the logo.
Any other suggestion, as I imagine and do agree, this is not straightforward, nore too userfriendly (well it's only admin side anyhow).