I like the CTRL+L shortcut in SublimeText and would like to have it in TeXstudio, too.
What it does: It selects the whole current line and places the cursor at the beginning of the next line. That way I can copy the line (including the trailing newline), delete it, cut it, ...
But I can't find a way to configure it. There is no such option in the "Shortcuts" list and I can't find a command for selecting text with a javascript-macro (http://texstudio.sourceforge.net/manual/current/usermanual_en.html#SECTION33)
Any help?