Home page Grid View- customization updating

The home page grid concentrates an overlook- for the PMO the overlook is of all projects in the organization. I need to prioriterize & define the order and importance between the many projects. 
The home page screen is display only.
I would be happy to allow the prioritization of the projects from the home page screen, I would also need a field for the prioritization - as such the Grid could be customized.

So you are looking for a customizable columns on the homepage so that you can add fields like "Priority"?

You can also double click any of the projects on the home page and add in priority there, would that work?

Regarding priortizing by adding a organization custom field - would I be able to use the new field in order to sort or select all prioritized tasks in a report?, I assume this feild will be displayable only in a customized view.

regarding the double click any of the projects on the home page and add in priority there,- I was not able to do this- I am able to update the project priority by the right mouse button - selecting properties and within the properties to update the priority.

How can all projects be sorted by priority ?
How can the priority of the projects be displayed on the HOME Page?

There isn't a way to display priority on the home page, the best way to do it would be in work items. I have put in a feature request for you though! As for the double click, I mean this as a way to quickly access properties (instead of right clicking). You can double click any icon to open up its properties.