1) when linking to a roster I have created will it then auto update when I add/remove members to the roster?
Yes
2) as it is now it will show all members as approved, can I avoid this to say awaiting approval which would be prefered?
With the auto-populate, I'm afraid not currently.
3) when doing this approach I need to select their individual role. this is great but sadly it doesn't remember my setting, so is there any place where members can specify their role?
You don't necesasrily need to specifiy a role for them, it's merely a role override. If none is selected, then it checks the character profile for their preferred role, and if none is selected there, it randomly selects a role.
You can sepcify your preferred role by clicking the "Edit" button on your character profile page.
4) I can't work with secondary roles - so I can't add who will be raid leaders and so on. Also a very wird thing is that it keeps tracking a normal member as the raid leader if I do set the event category to having a raid leader (this guy is named taranquill, so it seems completly random and not abc or rank wise)
I'm not sure I understand what you mean by this. You would likely specify Raid leaders then in the description, as there is no "Raid Leader" field.
5) when inviting a new member to the guild and giving him the right rank will the website then auto add them to the roster, or is it needed to manually do this?
If you are using the roster rules, this can automatically add characters to the roster.
Again it will just add the member randomly so the role setting needs to be done manually by editing the created event.
If you have the player choose a preferred role, that will alleviate the random role assignment.
An annoying thing is though that the roster is not auto updated when I promote/demote a member on the website. As it is now I therefore have to run each rule manually by Edit and submit it again.
It would be awsome if the website could do this by it self, or if you made a feture saying update rosters, so we don't have to manually run each rule.
Sounds like you found a bug. I assume you were promoting them via the "Rank Challenge" Alert, correct? This bug has been closed (as of this morning).
/Edit: I have found a few members missing on my raid roster, and can't really explain why they are not there, as they have the right rank on the website, and others with the same ranks are listed.
Connected: The inclusion rule only accepts mains, and Connectedias marked as an alt.
Fiddlefisk: Fiddlefisk has Frostwhisper selected as his server I'll be adding an "Eligible Servers" option because users selecting the wrong server is pretty common).
1) when members select they will not be attending, it correctly lists them as confirmed absentees, but it doesn't remove them in the role listing above. You can see this for yourself if you click on the raids starting from the 10th of August and forwards.
2) and a bit more wird is that there should be 45 members that should auto added but it only signs 42 members?!
I'm tracking these two bugs right now and should have answers in the next hour or two.