I know for a fact that they are hiring pilots but I am not sure weather its on the 737/CL200/737.... I few years ago they had a application form on their web site that you could download, fill in and send by snail mail. Check if its still there and just send it in! Nothing wrong to show interest even if they are not recruiting on the ATR, right? I think I can get the form for you if you can't find it.
CP