I wouldn't see it as an issue particularly if your using a tripod and doing long exposures if things get too dark. I can hand hold 35mm camera's reasonably successfully at 1/4sec and for some reason I like doing that. To do that though I will use any available object (wall... post... anything) to lean on.

Of course long exposures in dimly lit streets will render the street pretty desolate for the people may not even be seen in the exposure. So long as your into that I guess. I have always usually used slower films unless I want the effect of grain etc. 100 to 160 iso films are common place for myself personally.