Okay, then - here's my suggestion:
Serging techniques, using both domestic and industrial sergers. For example: How to serge individual double-on-half pieces without losing your mind. How to get close enough when serging several layers with industrial serger. (Modified feet? Lemme' see em'! Give me a photo so I can PROVE to the mechanic that IT IS POSSIBLE!)Which is preferable at what times: 3-thread? 3/4-thread? 5-thread?
Basically, anything involving a serger as it relates to fabrication. I'm using a tired domestic Babylock right now, but looking to the future (which hopefully includes an industrial).