I have not seen many UI suggestion posts in the forum, probably because awesome features are more exciting for most users, but I think, that UI changes can be just as important in some cases and are mostly easier to implement
So here are a few suggestions:
- disabeling/clearing supernovae (that work with realistic turned on), because supernovae cause lag and take up your view, so you have to restart the simulation, if you accidentally cause one
- Filtering trails by planet properties (i. e. mass, orbital period) to avoid too many trails in case of fragmentation or weird zig-zaggy trails for planets with short orbital periods, when the time is too fast
- an option to somehow save the settings you used to be used in every other simulation, so you don't always have to enable grid, disable rays and projected paths, over and over again, if you often play without them
- more short explanations (that appear, when you hover the mouse over it) for the setting options
- step time and target time should always have the same unit
- stop on collision option more customizable:
filter for properties (i. e. mass of smallest collision object, distance between objects)
(also this way it you don't need to hit play a thousand times after one object hit another, because of all the fragments)
option to autofocus on biggest/smallest colliding object
- selecting 5-10 "favorite" properties that will be arranged in an extra tag of a body to have a better overview of often used properties (for example, I like to use mass loss and distance from camera a lot and don't want to browse through the properties all the time)
if implemented, I think this tag should be shown once the properties are opened instead of the main tag
- shortcuts for changing the time unit might also be pretty useful (not plus and minus, but 1s, 1d, 1y)
- being able to set mass loss manually like other properties, maybe even add negative mass loss (mass gain), so you can for example watch a gas giant become a brown dwarf and then a star, with automatic and gradual mass gain, without having to manually increase the mass
- option to show distance between selected objects (the same way distance is shown, when objects are placed)
EDIT:
- also, maybe the "My Sims" tab shouldn't be on the outer right as it could be hard for beginners to find their saves this way
- it should be possible to add the eccentricity/inclination in the orbit tab before adding an object
- not sure if that is possible, but it would be cool, if you could set the barycenter of a system as the trail center (for example in binary star systems)
I hope other users find some of these useful as well or have their own suggestions
(Also, feel free to correct me, in case any of these features are already implemented and I'm just too dumb to fiind them
)