Add a Search bar? reverse sort direction?

Is it possible to add a search bar to the main databrowse app page?

I like the sortable aspect, but it is not reversible in direction.
We've got 107k records in one of the models people want to view,
Paging through it all takes a loooong time. :(

If there is a specific way to do this that comes to mind, I'll try to work on it and potentially PR it.