Anyone got any thoughts on what output gamma we should be targeting for Rec.709 4k/HD footage?
I know its "anticipated viewing environment" but in reality on stock and microstock its probably a mix between screens, mobile devices with some for broadcast so not quite that simple.  In addition the videos themselves are first shown to a buyer on a web page so likely a 1.96/2.2 gamma sRGB screen so can be brighter/washed out making them less appealing.

My current scenario is my monitor (DCI P3) is calibrated to gamma 2.2 because i do a lot of still photo work.  Should i then be outputting my stock video from resolve for 2.4 (or using a CST instead?) or keeping a full 2.2 workflow?

Does it actually matter?

I use gamma 2.4 timeline with output gamma set to same as timeline.

Probably doesn't make a lot of difference.  My assumption is our stock video footage will be used in a larger project whose final output's gamma is set to whatever they need/want.