1. OPEN AIR reverb has some weird bug where the equalizer does not work
2. studio one needs better support for connecting and managing external hardware
3. very unstable when loading third party effects, especially universal audio it can stutter after some time during playback
4. need a proper chord track plugin
5. need better arpeggio plugin
6. need better spectrum analyzer and stereo widener or mono maker..
7. importing midi messes up presets in VST plugin
8. need better AMP for guitars
9. needs a better tuner plugin that shows notes and better visual of audio..
for example if i used my ROLAND JV and forgot the preset should remember patch data in audio file

 

You might have better luck posting it HERE:

https://answers.presonus.com/questions/studio-one-feature-requests?sort=votes