...why isn't also the traditional form added?
For example few weeks ago I added the simplified "外国人"-word.
Today I　wondered why the traditional form "外國人" haven't shown up yet.
And then I realized that it was not in "My Words"-section although I activated "Also add characters when adding words".
Is this a bug or a feature?

"Also add characters when adding words" means that when you add the word "外国人" you also individually add "外", "国", and "人" to your My Words.

If you want to study traditional, go to [account], then [study settings]. Next to Characters, there will be a menu for things like Simplified, Traditional, etc. Select [Both]. From then on, "外国人" AND "外國人" will be added to your My Words (in my understanding).

Thanks for your swift reply.

I set this option (study "Both") since I started using Skritter.
Your understanding is right. It SHOULD do it that way. But it seems that it just doesn't do it as expected.
So I think, it's Bug.

Where did you add it--in the queue, or from a list? The queue currently doesn't add the alternate form for you; is one of the reasons why we're moving to make it use the list code instead, which is much better.

Yes, it's in my queue. OK, then I got it. Thank you for your support!

Yes that has bitten me in the ass many times. Damn you, Queue, for being so convenient and yet so flawed!

Now I know...well, then, I'm really looking forward to the queue revamp.

So am I! It's a doozy of a project, let me tell you, but I'm working on it every day.