[TYPO3] Include static (from extensions) not more than 20?

[Christopher Schnell]

Hi,

In my Installation I make excessive use of Frontend Plugins (customer 
wanted all the fancy stuff...). Now he wants a shop, which I am doing by 
commerce. In order for commerce to run, I have to add the TS-Template to 
the main Template via "Include static (from extensions)", which I tried 
to do. But whenever I add the template the yellow exclamation mark 
appears and I cannot save. First I thought of a bug with commerce, but 
than I tried to add another extension template and the result was the 
same. So I counted my included templates and found the miracolous number 
"20". So my guess is, that only 20 items are allowed here, which is not 
enough for me.

Where can I set it to a higher value? Why is it limited at all?

Regards,
Christopher.