A feature that I would like to see is "rocker" control.
That is, the ability to jump backwards or forwards a user
specified time interval. This can be specified with hot
keys or mouse buttons. For example, right clicking on
the mouse jumps forward x seconds and left clicking
jumps back x seconds.
Another useful feature would be the ability to replay a
section over and over until stopped. A section could be
selected and then a hotkey could be pressed where the
audio (or video) just loops over and over until stopped.
If anyone wants to do this and needs clarification on
any points, please contact me at