MySQL 5 BIT data type
Transactions in export
Create view and routine options
Mass editation of individual rows
Offer enum and set items in search - whisperer
Variables editation, especially timezone
Use event $intervals + microseconds in relative date functions
Optionally check IP address
Disable spell checking in SQL textareas - spellcheck="false"
Accept Tab in SQL textareas, Ctrl+Enter to send form
Highlight SQL textarea, then display query inside textarea in select - may use external CodePress
Blob download and image display in edit form (important for Editor with hidden fields in select)
Add title to Logout, edit (in select) and select (in menu) in style "hever"
Shift-click in checkboxes to select range
? LIKE %% operator
? Column and table names auto-completition in SQL textarea
? Aliasing of built-in functions can save 7 KB, function minification can save 7 KB, substitution of repetitive $a["a"] can save 4 KB, substitution of $_GET and friends can save 2 KB, JS packer can save 1 KB, not enclosing HTML attribute values can save 1.2 KB, replacing \\n by \n can save .3 KB
? Branch binary_compile: LZW compression of translations can save 30 KB, LZW compression of all texts can save 11 KB, remove of base64_decode() + using chars 127-255 in minification can save 1 KB
? AJAX editing - select page has all data to display edit form

Editor:
JavaScript data validation - columns containing word email, url, ...
Joining tables - PRIMARY KEY (table, joining)
Rank, Tree structure
Add whisperer to fields with foreign key to big table