If I am inserting my macro with the “Plus” sign and choosing it from the macro browser, the editor/configuration page for that macro opens up.
But when I am using the curly bracket and choose the same macro there, not editor pops up. I have to double click the placeholder to get to the editor.
Is there some config to specify this behaviour?
I think for the editor to open automatically in this case you need a macro parameter that is marked as required in the atlassian-plugin.xml 
Hi Sven, thanks for replying. Do you mind telling me which parameter that might be? =)
Thanks in advance.
See here. To mark a parameter as required you need to add the required attribute to it:
<parameters>
<parameter required="true" ... />
</parameters>
Perfect. This did the trick!
I was not sure if I need a <param name"required">… to achieve that.
Thank you!