I think that you are looking for connectorpads rather than vias, and you will need to modify the SVG files (which is difficult, I am working right now on both learning this, and documenting what I'm learning for others, but Inkscape has just bit me yet again 
so its going slowly). I don't think you will be able to make this entirely from within parts editor. If you post the Fritzing part you have and either the data sheet with the mechanical layout of the RF module or at least the pin spacing (I'd assume it is .1 centers, but a data sheet with dimensions would be better) one of us may be able to help you out with the svgs (the folks in here have given me a lot of help in the past!). Old_Grey: the rf module is somewhat like an IC it wants to plug in to the PCB (or more likely be soldered to the PCB on pads) to connect to a microprocessor so it needs a foot print for the 8 .25 inch posts with a hole big enough to take a .25 in pin and appropriately named connector pads to make connections to in breadboard and schematic.
Peter Van Epp