Any help to make improvements will be appreciated.

So, you're not really painting with it, you're just pasting it in places?
I just tried that out and I don't think that I can really do much with that, just create cool looking backgrounds.
I'm using the Live path effect version of that in the development version rather than the python effect
I'm using the Live path effect version of that in the development version rather than the python effect
using the development version of inkscape .46.
As for inkscape and being made backwards compatible, unfortunately it doesn't tend to work well. The problem is that we do like to take advantage of new features made available in newer versions of libraries. However, please know that we also don't tend to have requirements for the most recent libs. We do try and take enterprise & lts distros and such into account and wait for a year or so of a library to have been out before bumping requirements.