Highlight with tags!
For those who work with pdf documents often (e.g. for research or study), have you ever wished there was a tagging feature? It's like the equivalent of highlighting with different colours to mean different things. Let's say.. yellow for important stuff, red for things you don't quite understand yet.
Then - this is the important part - at the bookmarks view (which lists down all highlights, tags and annotation you have made), you can choose what is shown in the list, e.g. only the "important stuff" (yellow highlights) or only the "i don't understand this stuff" (red highlights), or whatever combination you want to filter by.
Of course, the tags are user-definable because everyone's needs are different. Another user could set up his red to be "follow up" and yellow for "yippee!" or something. Any way he/she likes it.
On the GUI, ideally, more tag buttons shown (hence only 1 click to switch tags) for tablets.
Need this for all kinds of research situations! Windows as well as android.
If these tags can be displayed with other pdf readers in order not to loose them when migrating to other devices, it would be great!
You should be able to sort the tags and search for tags
This would be so valuable!