This might be a duplicate report, however mouse support still doesn't work, as it treats the mouse as a touch device instead of a pointing device. Clicking and dragging as such (Even in DeX mode) is a pain, and really makes running Minecraft: Pocket Edition like Minecraft: Windows 10 Edition, really difficult. As I see alot of players tend to prefer mouse and keyboard over touch when on the go.
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Thank you for your report!
We're actually already tracking this issue at MCPE-9815, so I will resolve and link this ticket as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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for clarity; This is for the Mouse & Keyboard support section, which can also be used for accessibility due to people lacking screen-based interactions with touch, or other conditions.