The extensions I make are created because I have a need for them myself. So it's got my heart! So it is very useful for others to give feedback and show me what can be improved.
By the way, you can pay for my extensions. But you won't get any better support for it :D
I'm a Joomla newbie and Peter (the designer) worked patiently with me to solve the problems.
The best way to get the support is to ask questions on his bulletin board. He usually responses in less than 24 hours (and many times in less than 24 minutes!).
If you need to plop in code, use Sourcerer.
Please don't shoot me if I don't respond within 24 hours though :)