I've got to know about Pyomo (thanks to Nils Wagner) that is made by Sandia Labs (Trilinos/PyTrilinos developers). In the article they say "However, Coopr Opt is not as mature as the OpenOpt package", I guess that's the reason why my site daily visitors number has jumped from ~ 50-60 to ~ 80-90 this week.
Also, in the paper they inform of willing to collaborate with OO. I had contacted them long time ago but the provided examples of their soft usage were too difficult for me to understand and connect to OO during an adequate time. I guess it will be much easier for them to understand my code instead.