My original editor from the late 80's was Brief which was nearly universal and close to taking over Epsilon, but alas never happened.  However, it was right when Windows was coming about and Premia created a new windows text editor called Codewright (eventually bought and killed by Borland).  This editor allowed you to choose your key mapping, Windows/VI/Brief/Epsilon.  But the biggest feature it had (which originally came from Brief) was the ability to copy/cut/paste columns of data!  I can't tell you the power and speed this adds to my development.  There are so many times when I have a long list of something and to be able to slice out a portion right in the middle and paste it back in, is an AWESOME feature!  I'd love to see this added in, so far I can find no other editor that does this except Codewright and I keep my old version just for that one feature.  Other developers have come to me to be able to quickly edit things that would take them hours and I can do in a few minutes.

HTML5 & CSS3 Live Preview Window

Ctrl-Tab could show a small dialog (like super-T does) showing the last edited files if the ctrl key is not released. 

So we could use up and down to select any file (or do a fuzzy search). 

The first in the list would of course be the last edited file and on release, this file would be selected. (a little bit like cmd-tab on macosx or alt tab on windows). 

So usage would be the same as today if keys are released (but a little bit different if ctrl is not released)...

Making performant plugins is quite difficult right now due to complex thread management. Gevent would allow for libevent backed io in plugins and use of lightweight green threads.

When I click somewhere in the code viewer, it jumps well past where I clicked. (OS X)

I wanted to implement a plugin to get a split-screen view into the current file I was editing, and discovered that there is no way to change the window layout of the current window. Can you add this to the API? And ideally, implement a plugin with a TextCommand equivalent of File -> New View Into File, but splitting either vertically or horizontally so that both views are visible?

Just fell in love with Sublime, but what makes it feel awkward to me, is that it uses nineties style open/save modal dialogs instead of sheets. When you provide this feature, I'll immediately buy it.

Code folding on PHP classes doesn't work properly. When the hotkey to fold is hit, it folds the entirely class, even if you're inside a method or a condition/lood block.

keyboard d or c should sould to trigger the respective buttons

 Open a directory, as it was a project. Listing files and dirs in sidebar. Without saving any project file, if the user haven't made changes that need to be saved in a project settings file.