Bugs

Colour in comparison mode (bad interaction with edits for self-link colour).
If self links are prevented, but forward links are allowed, then we get stuck when trying to jump over the cursor.
Add option to prevent annotations of labels when in linking mode + fix handling of reading them in when they are present.
Log all actions with times

Ideas

Documentation

Visual

Show filename at the bottom of the screen when the info section is visible, on the division line
Option for 'next' and 'prev' to cycle (ie if it hits the top, search from the bottom)
Legend/key giving keys and their labels + colors
Rather than highlighting text, use columns on the left (block of colour), for line mode at least. Not sure about tokens
Variable location of instructions
For blank lines, option to print only one in a row
Handling clusters (make the set visible)
Show the set of available labels
Ability to colour linked items as they are created (to see the history). Either always showing all using different colours, or showing what the cursor is linked to.
Allow different default when resolving disagreements (rather than the union, only have those with agreement, or a majority). Note, this is subtle, as it interacts with the way colouring works.
Option to highlight matches

Annotation

Constrain annotations, e.g. a flag to not allow links to point in one direction
Make link vs. category vs. text changeable during annotation
Option to not allow annotation of some files (and not create a file)
Specify every chunk must be labeled, or only some
Allow auto-search over labels (i.e. user types characters and we search over labels to get the right one as they type)
Be able to annotate with errors (creating new errors along the way) and then sort by label
Be able to mix levels (e.g. dialogue acts per line, and named entities within the line)
Look into the Concrete format (https://www.cs.jhu.edu/~vandurme/papers/concretely-annotated-corpora.pdf) amd the LAF format for data input / output
Allow multiple annotations of the same file at the same time

Movement

Jump to next/prev unannotated chunk
Option to jump to a line
Add the ability to jump to the start/end of a paragraph (and expand / contract similarly)
Jump to next match on a regex
Option to have jumping retain the span's size (at the moment it becomes a single item again)
When the movement key is pressed multiple times in a row quickly, start jumping further [optional], or have a fast jump key?

Internal

Change help to be a mode (currently other keys are interpreted while it is showing)
Saving both cursor and link for linking mode (in todo file) and reading similarly
For help, compose it out of a set of items, with line breaks changing when the screen is narrow

Supplementary tools

IAA calculator (at all possible scales)
Take standoff and create inline data (instead of adding inline as an input / output)

Misc

Add a calibration mode, where people type keys so I can figure out what they mean (and they could customise things)
Add logging of all edits to a file, so a crash can be recoverd from easily
Support undo to reverse actions
Add the option to read in the raw data when going back to a seen file
Option to load all at start
Option to only save on exit (not when changing files)
Nicer argument, error, and logging handling
A 'new user' mode on startup that toggles a bunch of things