I think Audio Batch Converter could be a complete tools also for create audio snippets from tracks for promotional uses.
But it lack some features, especially for the Extract Section
1 - Select/draw loop range from waveform.
If not possible introduce this feature, having the timeline on the waveform could be a serious help in this task.
2 - Audio Processes per track. This feature will open endless possibilities, no needs to add more on this.
3 - The "Start Offset" in Extract Process seems have a kind of "logarithmic" behavior.. it's impossible pick a precise time after 2 minutes. Please fix it.