Open class InstallationApplicationWeb for inheritance and parameters

One case is creating a custom installer extending class InstallationApplicationWeb.

 The issue here is the the constructor by default is completely locked down.

It is impossible to instantialize the InstallationApplicationWeb class with customer parameters, for example to setup a custom session handler which is hardcoded later to use Joomla "none" handler using files.

I'd like to open the class by either removing the final keywork or allowing parameters in the constructor, or even both.

This would enable one to use different session handlers for installation like memcached on Google Apple Cloud since.

Tracker Item: http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemBrowse&tracker_id=8103