Thanks for your feedback. We have made a note of the same and shall try to incorporate it soon.
Acrobat DC Mobile Team
Hi, Let me add a couple of comments about the palm rejection capability. I think I might have over simplified as to how it should function. If the screen locks in smart zoom mode then you can't scroll up and down the column, which would make it difficult.
There's two primary use cases for palm rejection that I can think of. The first being Acrobat Reader DC is running on a device with either a digitizer in the screen or with an active stylus that is connected to the device via wireless (probably Bluetooth). With both of these approaches the device will sense the stylus is either near or in contact with the screen and thus an API for one of these devices will sent a signal indicating to lock the screen, so thus Acrobat Reader DC should be "API" aware for the few styli on the market that offer this capability.
The second use case is with a capacitive touch only screen where it will be more challenging on how to do palm rejection since the software will need to either determine to lock the screen or a small button will have to be created to support toggling screen locking on/off. This will be the more challenging use case to implement, might even have to be user selectable.
Please contact me if you would like some additional input on this kind of a feature.