Lastly I've submitted my first 2 blu-ray profiles created for 3D blurays and I set the value of the "Edition" field to '3D' because I thought this is the correct way - I simply checked a few of my owned 3d blurays and noticed it is done quite often this way.

But next I thought it might be a good idea to set this 'edition=3D' for all my 3d blu-rays where it's not already set and contribute the changed profile and stumbled across this one here:
Baymax 3D

In this contribution thread 'Lobo1980' says

Quote:
Remove 3d from Edition (3D is not an Edition. Sometimes it's written at the end of the title and there, but it is in Dimensions as 3D and 2D disc.)

( corrected 'Remote' to 'Remove')

So - what is the correct way to insert '3D' into the title? Basically I'd say in case a movie is available as '2D' blu-ray and additional it's also available as '3D' blu-ray it looks like an edition to me, either I have the common '2d' edition or the '3d' edition.

But I also noticed that I can only select 1 value for edition - so in case it is e.g. a 'Limited collectors edition' and '3D' I'll run into problems

Please help me to understand how to it the correct way 

Ken has ruled on this already--3D almost never goes into the edition.  Here's what he said:

http://www.invelos.com/Forums.aspx?task=viewtopic&topicID=585852&PageNum=3&messageID=1697026#M1697026

Quoting primetime21:

Quote:
Ken has ruled on this already--3D almost never goes into the edition.  Here's what he said:

http://www.invelos.com/Forums.aspx?task=viewtopic&topicID=585852&PageNum=3&messageID=1697026#M1697026

Any chance a link to this post from ken is included into the contribution rules? It would make the life of newbies like me a lot easier...

This is the thread Pete is referring to.