Simplifying the UWL 'Show Filters' option

In EP7 (2004s) the default UWL filtering option is more complex than we would like, all we want is for users to search by a text string on their work items as per our old release (EP6).

The UWL documentation states that the link 'Show/Hide Filter' can be hidden but there is no mention whether this can be customised.

The options 'High Priority', 'Due Date' and 'Sent Date' are irrelevant for our views hence we would like to remove them even if this required amendment to the SAP standard UWL code.

I've looked in the PAR files com.sap.netweaver.bc.uwl and com.sap.netweaver.bc.uwl.ui but I can't find where these options are in order to remove them.

Does anyone know how the filter can be modified?