CorelDRAW Graphics Suite X5 :: Extended Lengths Of Multiple Grouped Lines?

CorelDraw_ExtendedLines.JPG

I have a time consuming problem that I was hoping a work-around or solution could be found for.

Some background: I use CorelDraw sort of as a CAD file creation software. The tool I use traces out straight, horizontal and vertical lines. At times, there are areas that need to be excluded being processed over, so my design has holes and gaps in it. The tricky part is, the tool I use needs time to accelerate up to full speed before I want it to start it's process. This requires that I add the same length to every single line in the layer (different layers need different added lengths). The problem that I run into, is that if I select multiple groups of lines that are not the same length and try to extend them, CorelDraw sees them as one group and extends the largest lines the right distance, but shorter lines get a different percentage of the distance, and gaps get shifted. I put in pictures of what I am talking about (a before, a good, and a bad). 

can I select all the lines in a layer and tell CorelDraw to add X length to all of them, while keeping their center positions the same? It would save me a good deal of time.