The UI of the SharePoint Console portlets can be controlled by a custom stylesheet that is loaded with the banner in the SharePoint Console. The styles that control the portlets are:
/* column controls */
.MRUIconColumn {width: 25px;}
.MRUNameColumn {width: 70%;}
.MRUSiteColumn {width: 30%}
.MRUPropColumn {width: 20px;}
.SearchIconColumn {width: 25px;}
.SearchNameColumn {width: 70%;}
.SearchSiteColumn {width: 30%;}
.SearchPropColumn {width: 20px;}
While it is not possible to add new columns, it is possible to remove columns by changing the styles. For example, to remove the "Site" column, replace the value {width: 30%} to {display: none} for that style.
The stylesheet is located in the following folder:
PT_HOME\ptimages\imageserver\sharepoint\private\css
You can copy the styles to your custom style sheets for use in areas where the SharePoint Console banner is not used.