A hotkey for copy and pasting events. (For example: press "c" when the cursor is over a specific event to copy it, then press "v" over the area you want to paste the event.)

Have the preview window show icons (or something) that indicate specific events. So if there's a spring on a specific tile, have it show a little spring icon on that tile in the preview window.

Have the ability to start Jazz/Spaz/Lori at any position in the level when you use Save/run. This would be useful for testing a specific section of a level. For example, if you hit save/run, it would display a dialogue box with text boxes to enter the specific position you want to start at. If no coordinates are entered, it would start you at the Jazz Start position or position 0,0.

I don't really know if this is possible, but let Bolly use Endtexts other than 0.