Can we put down markers on planets and have search capabilities of that?
You can use such little scripts.
// Olympus Mons
// put in SpaceEngine\docs\scripts
// Open console, type:
// Run omons (without .sc)
LandTo 18.247 -133.173 4000
Put it in 'Spacenegine\docs\scripts' and start it in the console with 'run omons'.
This and similar can be found in 'Example.sc', in the script directory.