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sdsffwe Welcome to Pakistan.
Just stumbled upon your thread now and I must say I enjoyed the responses. It's heartening to see so many people spare time and patience to assist you. I sure do hope it helped you settle in.
I realize that I am late in responding to any of your questions and I don't really know about 'modding' EVO Nitro, but PTCL sure is a great alternative to Nayatel. You can get a 4MBPS or 10MBPS broadband connection along with a landline telephone installed if you wish. That would be an alternate to EVO Nitro (minus the portable dongle ofcourse).
I noticed somebody mentioned Rawalpindi being the dark city and you probably misunderstood it as being a dangerous one. I don't mean to play the devil's advocate here but being a resident of Rawalpindi, I can tell you it's a good place to find stuff (ranging from garments to consumables) for cheap. Sure, it isn't as 'clean' or as developed as Islamabad but it is certainly not the Gotham that you might just have started to think it is.
Just thought I would clarify that for your understanding.
I hope you thoroughly your stay here.
Stay blessed.