If there is one thing I could suggest, it would be making it easier for people who dont like using the mouse much - keyboard shortcuts, and the annoying "Delete Resource" dialogue boxed should be smaller, or maybe appear next to the mouse. I often go outdoors with my laptop and do coding, and having to move the touchpad constantly when my fingers are on the keyboard is somewhat annoying.
As to other things:
-Glitches with the script editor - when code lines are longer than the page, all hell breaks loose. Vertical scrolling is also a bit iffy.
-Maybe intergrating the ENIGMA compile window into the IDE itself? I noticed there is simply LOADS of space left on the top toolbar, even on low-res screens. Maybe a simple version of the compile window could be put there with a percentage bar or something? Maybe you just need to press a button to make it 'pop' out into the normal windowed version?
-An ability to define the location for the GM manual. Many people have .pdfs of the GM documentation hanging around, and the help button actually being able to link to it would be very helpful.
This may sound obvious, but perhaps the MOST annoying thing about LGM is the lack of a built-in graphics editor. Its a lot of an ask I know, and a bit off-topic, but a very simple intergrated graphics editor, nothing fancy, would be so helpful. Either that, or better intergration with external ones. GIMP and KolourPaint tend to play up a bit when used in conjunction with LateralGM.
Thanks for reading; I hope it was helpful,
Zesterer