Olympus OMD EM-5 body + the 45mm as my only lens (is it possible?)

i  took my 50mm nikon lens (on my d7000) for a day of street shooting and i found it very restrictive.. i had problems taking many of the shots.. i was walking along narrow streets in europe and standing on one side of the street.. couldnt get good shots (buildings, people) on the other side of the street ( you know.. those typical take-a-shot-of-a-person-walking-past-a-door shots).

so thats a 75mm equivalent...

so the 45mm for you would be like 90mm equivalent... you may run into the same issues.

I find that an equivalent focal length of 50mm (as many past famous pros use/d) might be better.. so that would be around 24mm for you...

just a thought.