I believe there isn't but you could ask same question here: SAP BW Extract
This is the limit we thought would be appropriate to have as after this it would be quite difficult to extract all the values over all the categories over all the levels...
Thanks very much for the pointer!
I found out that I can limit the number of dimensions when creating the extract, there is an "import only some dimensions" option. Unfortunately, I need to exclude the dimensions one by one. With 200 dimensions to exclude, this is a real pain..