During UI review with newcoming video editor and UI designers, we highligted several UI issues. We gathered these issues by topic

Finding functions without even looking for it

Toolbar standard actions are not so pertinent : New/Open & Copy/Paste not often used (see kate: no toolbar)
- Designer note: (toolbars) add space in the layout even if not so useful...
- rather offer to navigate between project steps: import clips, add transitions & effects, export (Première: changes layout, eg popping the color grade panel or the export panel)

For newbies: common habits of any software

Beginner layout : make timeline larger ; don't use tabs? ("Combine Classes of functions in combined views")
Import ? (not in toolbar, nor file menu, but Project / Add clip)
Drop transition from a list?!
Effects => preview. beginners need some help (experts will like filter); Pan & Zoom should stand out
Publish : Render => "File / Export" (render is sometimes "calculate effects") + should stand out in toolbar (cleaning the latter)
Render widget should only show codec & presets + start(queue), all other options hidden. Preview quality à la HandBrake?
Direct send to youtube etc?

Usual layout : effects list behind project bin ; effects stack behind Clip monitor or on Timeline side
Start playing project clip in monitor: Double click? Space bar OK
In/out zone OK, but then a shortcut to queue on timeline + pbm to put at 0 time !!
Resize : roll edit tool (move touching clips ends simultaneously) or resize one end + delete gap
Transition on track (ctrl-T) ?
Adding titles: hard to find, should appear in project toolbar

Zoom
- factor too sensitive? Linear not most effective (frame / clip / project)
- should keep center on playhead (except fit all)
Thumbnails allover timeline clips?
Video scrubbing on bin thumbs hover !?

Monitor & Timeline toolbar tiny on highDPI (tools should be on top rather than bottom, which is for status?)
Balancing panels sizes (=> sidebars?)
Splitter to adapt timeline height hard to see & catch

Always display tabs as titles => better alignment between panels, drag tabs
Align texts in project bin table (should filename be a different field from description? could be the default description)
Indent effects stack top line to lower sections

Timeline: use more informative cursors
- resize: green blinking arrow uggly + shows only 1 direction => use splitter cursor (2 directions)
- over clip : 4 direction or hand cursor (ready to move)
- Point for fade too small => rather use hover icons in corners (à la Dolphin)
Ctrl+Wheel (zoom) & other mouse shortcuts: should be noticed in status bar when pressing special keys?
Track labels ("Video" and "Audio") give wrong info (both are generic... except for split audio !)

Bin properties surprizing, how to close?
- add a info icon in prj toolbar (hover icons on thumbnails? no if we add scrubbing)
Project search/filter => Label (HIG) ?

Effects stack: header could be more informative
- "effects for [source]" is the same for all cuts => add track & timecode

Effects list
- Click on group name should expand
- Right click should popup context menu with "add to current clip", "bookmark"

Wizard => more frigtening than helping
- check install? => popup in case of important miss
- default profile? => rather always adapting to clips! (keep raw material quality) + add project bin action "Adapt profile to this source"
- in case of profile overriding (project close yo your target) & export settings, give more explanations (eg FrameRate by country?)
Get Hot New Stuff: not in download menu but in Settings