General

Basic editor functionality
Edit common properties of all objects
Custom files for the editor; allows creators to have features specific to this tool saved
Autosave
Unlimited custom objects
The program warns but doesn't limit going above the object limit (applies for both 40,000 and 80,000)
Add-ons and custom scripts
In game timer / time in editor
Next free layer button

Functions

Some sort of 'for loop'-like thing to place/edit/delete a lot of the same action over and over with different groups (probably even within triggers), colors, etc.
Automatic block variation
Looping trigger module
Option for randomised block rotation and scale for placing objects
Scattering objects or object groups randomly over a specified area
Speed control (.50x, .25x, etc)
Replace object(s) with other object(s)
Linking object data like id's and colours to other objects
Proportional editing (https://bit.ly/2z2UQLe) with the following types:
- Linear
- Sharp
- Constant (to move multiple objects at once)
- Sphere
- Random
Pivot point dropdown (https://streamable.com/22ouq https://bit.ly/2JhnrRG)
Smart Replace (https://bit.ly/2JkafeS)

Camera indicator when playtesting. Moves like the in-game camera. Different options for monitor resolutions and styles: corner indicators, white border, hide outside (Covers everything but what the player would be able to see)

Filters for editing, deleting, selecting and visibility (by group, object type etc.)
Selecting objects that belong in the currently selected triggers' target group IDs
Selecting an object and choosing select linked. This pops up a menu that allows you to select everything of the same type (color, group, rotation, editor layer, actual layer, object type)
Randomized selection over an area

Scroll -> vertical scroll
Shift+Scroll -> horizontal scroll
Ctrl+Scroll -> zoom
Middle Click Down -> moving the scene ?
When you perform an action such as scale(s) or rotate(r) with their keyboard shortcuts, you can type the rotation or scale value in.
Right Click -> Delete