You should use feedback. Could you explain what you mean by video lane functionality.
Audio lanes can rearrange themselves based on role assignments. For audio it doesn't matter of course which lanes are on top and which on the bottom. For video it matters hugely. Do you want a mechanism to automatically rearrange video lanes, or to manually restack video lanes? Not sure this is a good thing for a project where you might not know what's happening to a lane somewhere past the one hour mark.
Tom is right. Think it through. The vertical layering of video elements on a timeline has a direct impact on their compositing order. You can rearrange audio layers until the cows come home because there is no visual component.
Video roles already adjust the colours of clips. The only thing that might be useful is to carry over the "Focus on.." functionality of audio roles - to shrink down certain video roles so they take up less vertical space. But without the benefit of lanes, this would be a visual (and a programming) mess.
It makes sense for those reasons why they wouldn't make video lanes.
But I was thinking having lanes to organize visually, perhaps separate B Roll, titles, main storyline etc. would make sense to help organize the lanes like that. Without the ability to move them up and down. It seems like they removed the ability to shrink video roles entirely.
Previously, you could shrink roles individually, but as far as I can tell you can no longer do that for Video roles. For example, in one project I had B-Roll, Titles, Photos and Interview. Occasionally I would shrink B-Roll and Photos to help with visual clarity, but I dont think you can do that anymore.
You can expand a video Roll in the Timeline Index to its subroles, select it an all of that role or subrole will highlight. Just like before. Here I have a Roll called Video, with a subrole Video and subrole B-Roll Video.
You do know that Role Colors applies to Video Roles, just like Audio Roles, right? But there's a catch. It only really works if it is a video only clip. If there is audio content, the audio role determines the color of the clip. But that gives you colored video clips, which visually works for me.