AMB reader:
- some minimalist help (about keys) under F1, also a message "PRESS F1 FOR HELP" at start
- some way to quit the application without pressing ESC many times (ALT+Q?)
- full-text search (ALT+S)
- alternative color schemes or custom scheme
- SHIFT+TAB to jump to previous link
- alternative cursor keys for keyboards that have no arrows (WASD or something else)

ambpack:
- detect & report dead links during archive creation
- warn if files contain high-ascii characters but no unicode.map is present
- warn if AMA file contains lines of more than 78 displayable characters
- warn if TABs are detected in AMA files
- index computation

phpamb:
- full-text search