I think this is a HUGE issue that should not be taken lightly. A guy scanning certain websites from Iran IS going to attract some attention no matter how benign his motives. It just won't be taken lightly. That attention can land you on lists you don't want to be on.
I'm not saying that I don't sympathize with his/her situation... I just think that certain actions can be viewed by people with a security mindset as hostile. Indeed it may only increase the number of sites being blocked. As well as, SEVERELY restricting his/her ability to travel without being arrested. And if you attract enough of the right attention... you may find that being arrested is the least of your worries.
And all of this doesn't even take into account what Iranian authorities may do from their end.
Advice like this, given on a public forum via easily identifiable pseudonyms, should be taken with a BIG grain of salt.