modifyng parameters after inserting a feature

short answer is no not that way..

Longer answer, there is an addon that creates Primitives that stay adjustable after creation: 

Here's a short video with a link to the Addon in the description:

https://www.youtube.com/watch?v=zUFWcGAoDPw

thanks a lot, I'll try it. I came from cad, but meshes and parametric drawing are apples and peas... this characteristic is what'll make blender top over the top of the world