Oh I just realized this digging into the Sketchup API reference! 
So no hash for exports except DAEs. I simply replaced the "opts" parameter with "False" and everything works fine... You just have to set the OBJ export parameters right before running the script.
Anyway, thanks a lot again! This will save me a lot of clics! 
I attached the "revised" cleaned up script if anyone needs it!
David
Here is the script!
model.export function already has a second argument... perhaps changing the last two variables (double_precision, vertex_normals) or adding a new one can help?
OBJ batch export script, adapted from TIG's DAE export script
Hi TIG,
Thanks a lot for all your plugins!
I managed to adapt this one to be able to batch export skps into OBJ files, but I still have to clic "OK" on the "OBJ Export Results" popup to move to the next file, which is a little bit annoying for a batch process! 
And of course I don't know how to code this to do it automatically... could you or anyone else help me? Thanks!
David
Hi all, here is my attempt to match as accurately a picture and a model. Sketchup for the modelling, Kerkythea for the render, a little glare and DoF in postpro...
Picture and render...
Hi! Nice little ROV!
Here is what I personnally modelled with SKP a few months ago. Rendered with Kerkythea.
Still some work to finish it though... Grabber arm, 7-Function...
Thanks!
But these are actually BIG machines...
A little glimpse to the subsea equipment used to produce oil & gas in deepwater environment...
Entirely modelled in Sketchup, and rendered in 3DSMax Mental Ray.
