Open Source is not a price tag. It is about people investing time to fill a need they have.
If you have a need to get Velbus working with LinuxMCE, you are free to take a look at the protocol available on their website. And have a look at the already existing drivers in LinuxMCE (PLCBUS, KNX/EIB, Z-Wave etc), and try to understand how they work. What you learn from those drivers, you take, and apply it to the Velbus protocol. A few weeks later you will have written a Velbus driver for LinuxMCE and everybody can benefit from your work. That's the beauty of open source.
Enjoy your trip to the wonderful world of open source software programming!
PS: Don't pull the "I am not a coder card". Invest time, and you will become a proficient enough to write the driver. If you have specific questions, come by the #linuxmce-devel channel on Freenode. If you are new to programming, go to the nearest bookstore and get yourself a C++ for Dummies book, or something similar to get you going.