The TreeList component of the Gantt chart is not intended to emulate the grid and all of its functionalities, as they don't correspond to the feature set needed for a gantt chart.
As for the specific features you specified:
- Pagination - since the gantt represents a tree-like structure with parent and child tasks, pagination is not applicable.
- Column filters - you can log this as a feature request in our public feedback portal:
- Column Template - the feature is logged in our feedback portal and you can vote for it here:
Telerik by Progress