Thank you for your responses,
I know allpages does not return all pages but the itemcount after filter but before an top and skip and such. English is not my native language and I stated that clumsily. It was correct of you to remind me of that.
I can't see why $inlinecount could only be added to the odata formatter. An ordinary json or xml response could surely be wrapped in an object with an inlinecount property. Most certainly when the action returns an odataresult. However i can accept that is not the way it is done by default. I will just create my own formatter to compensate for this.