My animation team as well as myself, have been begging for this feature for a really long time. We are constantly, accidentally clicking on our Work-Area bar, offsetting a couple of frames on a few occasions, and then sending for render, only to discover our opening fade in is half-way through it's transition, or our end is now too long and we have content disappearing.
We desperately would like to have the ability to right click on the work-area bar and select "lock". This would maybe put some strikethroughs over the range, similar to a locked layer in Premiere, do show that we can't make adjustments. If you click and try to set it it could say "would you like to unlock and make changes?", or you could right click and "unlock". Huge timesaver for those fire-drill projects that cause the stupid mistakes.
Thanks!