I observed that Windows installer is able to add only the Python
installation folder to the path. 

In addition to this it should add the Scrips folder because many python
tools are installing scripts inside it, scripts that the user cannot us
unless he add this directory to the path. 

This is very annoying because if you modify the PATH you need to
logout/login in order to be able to use the new PATH value.

For now you can modify the path yourself, and only once, by following 
these instructions:
1) Open the System Properties either via the Control Panel or pressing 
WinKey-Pause
2) Click on the tab that says Advanced
3) Click on Environment Variables
4) Under System Variables, scroll down and find Path
5) Click on Edit
6) Add ;X:/PythonXX/Scripts where X is the appropriate drive letter and 
python version.
7) Click OK, and OK again.

You might have to reboot, but now that it is added, you don't have to 
manually update it.

Thanks Isaul,
Anyway I made the required change before submitting the bug first time
and additionally to what you wrote it is enough to logout/login to
update the path - no reboot required.

The bug is about repairing/improving Python experience for all Windows
users. Imagine that you want to deploy Python plus some extensions to
many Windows computers - you will have a hard time adding Script
directory to the path.