I've seen somewhere the request for better management of Gcode within the projects. For me I don't use the GCode-Manager, but manage the gcode together with the projects, as I like to have all files together at one place.
In addition to that it would be nice if Repetier-Server would read out certain information from the code like printspeed and infill, pre-calculate the ETD and show this in some information-window if clicked on or mouse-over the gcode file.
