I perfectly understand your frustration and I am really sorry. We would only be happy to fulfill each request that we receive in as little time as possible. But apart from this one there are hundreds of other requests collected over time and some of them have even higher priority for us (like Mac support). All I can say is that an improved File Transfer mode will come with version 7, and version 7 will come with Mac support which is this year.
I completely understand your position, I myself am a programmer supporting a Windows service deployed in many environments that connects to 4 different types of databases on a schedule. I know it is hard to prioritize your time.
All I can say is that for me, the file transfer and sessions becoming disconnected frequently has been my biggest hangup going from a free customer to a paying customer. There are a LOT of things I really like about Remote Utilities, and I would love to purchase a license, but I get disconnected so often and have file transfers fail so frequently I am having a hard time submitting the order and sometimes just end up using Remote Utilities to help me get connected using something more stable.
Would I love OSX support, yes. But to me, the goal should be to solidify your existing customers experience before chasing a new market.