Its not a big deal, but for some search dialogs where I disable paging, it would be a nice to have, to display a bottom toolbar with nbr of records in the grid.
Obviously I can write my own, but meh you have it all there 
Support Forum
Would the paging toolbar with disabled controls serve the purpose? Or a https://bryntum.com/docs/grid/api/Grid/feature/Summary toolbar with the number of records?