Feature request: disable sparse infill bridging

[DeepSOIC]

Hi!
I want to print a model that is to be like a sponge: sparse infill, and nothing else (no perimeters, no nothing). However, even though I've set the number of top solid layers to 0, and perimeters to 0, slic3r still kinda makes solid top with what looks like an intermediate layer. It also seems to treat overhangs as if they are bottom layers, extending them solid deep into the bulk.

I must admit that Slic3r seems to be attempting to increase precision of the print this way... maybe... but precision is not needed here. I want permeability!

I've packed a config file, an stl file, and an output g-code into a zip, which can be downloaded here:
https://drive.google.com/file/d/0B9lBm-SSD5KSQVlVNlZjUmN0alk/view?usp=sharing (1MB)

OK, I think I found the way around it, but I don't want to fight Slic3r's smartness. That's why I ask for an option.

Slic3r v1.2.9 on Windows 8.1