SDE, BWAPI owner, hacker.
How about some of these:
1. Bugs and Perceived Bugs- For some reason the string editor immediately crashes for me. I am using the official 1.16.1 installation.
- I don't see location names on the map.
- Start locations are contributing to the unit placement limit, but they don't actually count when being loaded by Broodwar
- Many others that people have pointed out
2. Remove things that are either unused or not relevant- "Raw Flags" in location properties
- Players that can't own triggers ("Unknown", etc) are misleading and can be removed
- Races: Independent, Neutral, Invactive, Human
- Players 9-12 in map properties
3. UX improvements (within the current realm)- Icons in all tree views and dropdowns (units, upgrades, terrain tiles, sprites, doodads, including Map Settings tabs)
- Better doodad names (i.e. Jungle - Water #0 -> Flooded Temple? Honestly just ask the community to make up a list for you)
- Multi-select: Unit Settings, Upgrade Settings, Tech Settings to edit multiple settings at a time
- Unit/Sprite limits could be set to their maximum allowed values by default
- Player colour preview in dropdown
- Search/Filter Unit/Upgrade/Tech/String/Wav and classic triggers
- Allow triggers without conditions ("No condition" is the same as "Always" IIRC)
4. Things that are missing- Secret trigger actions: Enable/Disable use of ESC to skip transmissions
- Secret briefing action: Show skip tutorial button
- Allow "Preserve trigger" checkbox instead of taking an action slot, as well as "Skip conditions once" (i.e. CHKDraft utilizing previously unknown bit values)
5. As of 1.18 PTR... (probably want to wait until it's official?)- UTF-8 support everywhere
- Can probably much more easily emulate character display by loading the new layouts and font files
Probably a bit more I'm forgetting. Please ping me for dev work on any editor enhancements.