MySQL 5 BIT data type
Transactions in export
Create view and routine options
Function to fix database encoding - http://php.vrana.cz/prevod-kodovani-mysql.php
Highlight SQL textarea - may use external CodePress
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"
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"
? 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