Ext3 Under OSX

I recently got a replacement notebook, since my favourite MSI s271 presented quite a few disk errors on smart, and it's a while that this one has the usb nonfunctional.
After looking for a new notebook, in the 12"-13" range, I found with some disappointment that those niceties come at a premium price, and most of the time they are built on cheaper consumer-level standards.
So, after some research, I went for a refurbished MacBookPro, the newest model with a 13" screen.

Now the challenge is, reading all those external disks (or internal slices/partitions) which are unfortunately ext3 formatted.

I tried not to choose the straightforward path which leads to Paragon software, and instead go the MacFuse way. This post helps a lot and basically it's all you need: http://forum.archosfans.com/viewtopic.php?f=47&p=220020

The modification to the script is really needed only if you require r/w, which is basically not advised from the authors of fuse-ext3, my tests say they are quite ok.

Now I need a way to bypass the default users and permissions that macosx uses to be able to write/read the data both under linux and under osx without touching sudo or becoming root.