Can you zoom in upon documents besides using the call out?
Also when you are in presentation mode you can choose the zoom area option instead of a call out type of result you just zoom in upon the area you selected. See the powerpoint attached to the bottom of this page.
Is there now an app for other tablets besides Ipads?
https://iprotech.com/software/trial-director/
Tablet Toolbar Preference
A new toolbar preference provides larger buttons when using TrialDirector with touchscreen surfaces, such as the MS Surface Pro or other tablet PCs. Users can also lock the toolbar annotation buttons.
https://itunes.apple.com/us/app/trialdirector-for-ipad/id563312644?mt=8
Free download for ipad above