Sliding scale for zoom

Comments by several contributors suggest that vision difficulties are common and if you want to zoom in on a piece of a window it would be nice if it could be done using a sliding scale at the bottom of the relevant window. Word, Excel, Nisus, Scrivener all have these options. Failing that, how about a menu for zoom with %ages from 25% to 300%. This is faster and more intuitive than keyboard zoom settings. Is this under consideration at all for DT?
It would also be nice if the window stayed that at the relevant zoom value until the user changed it.
Just some hopes.

Nothing is currently planned for a magnification slider, but the request is noted.