Customizing the admin form

Hi,

I have customized a model admin form, editing the label_for_instance for a ForeignKey field and a MultiChoice Field.

As a result the plus button was gone. How can I insert it back? (didn't find anything in the documentation)

Couple more questions:

1. I have a django mptt key and when I edit I can pick the same element(how can I populate it without the one that I edit)

2. How can I add descriptions for the fields

3. How can I remove the validation of certain elements and insert my own(I'm using a slug field and it doesnt accept anything but ascii, I fixed it so it would work with utf8 but the validation remained)

Thanks !!

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