Eurosmartz WePrint server using Print Central.
Believe me, until direct printing is supported, which is unlikely with the large driver files needed to interface with most printers.
The plain and simple of it is that most printers could use what is called a generic Post Script driver. However, every one and their uncle will complain because basic printing won't be enough for them.
"Why won't it scan from my document feeder, I printed from e-mail within the printer and my iPad won't recognize it's file format, my printer is saying incorrect paper size, I'm getting a 50.4 error saying uncompleted data, blah blah blah"
That's all you would hear from many users if generic post script was the only option. To this day, many people install a full DVD suite of software to control one printer. When all that is really needed is a simple generic driver. For most that are tech savvy this would be ok, but you have many more that would assume all those other features should be supported.
HP has an app that prints photos or images directly to HP networked printers, but that leaves out the other 80% of apps or documents that also need support.
Your better off for now sticking with one of the print suite apps like Print Central, that support many doc types, not the other way around, an OS that hardly supports one printer.