Feature Suggestions

Try this.
https://digitalfossils.com/Download/NVil-Apr-19-26D-Steam.zip

Fixed. Thank you!
One more thing. Noticed this. Is there an option to hide this tooltip, it happens everytime a loopcut is used and seems quite useful first time, but distracts later. At least because there is too many text and it is orange

Try this.
https://digitalfossils.com/Download/NVil-Apr-19-26F-Steam.zip
View > Display > Heads Up Display > Show StreamLine Tool Hotkey Prompt


--24. Add a checkbox in Preferences to use LoopCut in every subobject mode, or to automatically switch to edge mode when using LoopCut (or make it work in every subobject mode). Now I handled it with a little bit awkward Composite Tool, but looks like it would be great to have an option to this in preferences for everyone
Q: Can you send me an image of the composite tool contents? info@digitalfossils.com.

--7. Make P_Chamfer Edge to work with objects enabled symmetry
Q: How do you tell it does not work with objects enabled symmetry? It works in my test.

Try this.
https://digitalfossils.com/Download/NVil-Apr-19-26H-Steam.zip

--24. Add a checkbox in Preferences to use LoopCut in every subobject mode, or to automatically switch to edge mode when using LoopCut (or make it work in every subobject mode). Now I handled it with a little bit awkward Composite Tool, but looks like it would be great to have an option to this in preferences for everyone
A: When subobject stramline tool hotkey pressed in object mode, selection mode will be switched to subobject mode automatically.

--7. Make P_Chamfer Edge to work with objects enabled symmetry
A: See if it is fixed.

Seems working fine, thank you

24. Maybe it should be a checkbox on preferences. I assume some people may have their object mode tools assigned on the same buttons of streamline tools for subobject mode. So they won`t get access to their object mode tools as it automatically switches to subobject mode

There is no need for a check box. Because in the situation you described, the tool for working in object mode will be activated instead of switching to subobject mode. You can make a tool to test it if you want to.

Great!

Try this.
https://digitalfossils.com/Download/NVil-Apr-28-26-Steam.zip

--5. Hide multiple selected objects in Scene Explorer with Shift + MMB (or whatever hotkey)
A: Done.

--21. A tool to make spline between to selected subobjects (to make instant plugged cables for example)
A: https://youtu.be/ZQgoPOYJmTo

--22. (screenshot) "Change segments on the fly" Tool. It allows to adjust segments on curved surfaces. It would be handy in gamedev pipelines. It not just doubles segments - the tool is flexible and can change from 6 to 9 or 16 for example. Especially would be great to change cylindric object segments on the fly
A: https://youtu.be/Vu-0hkQELpA

--26. Add "Scale Only" Reset Element in "Reset Object Base" command
Q: There is this tool already, Reset Object Scale. "Reset Object Base" has nothing to do with scaling.

Hi! All features are great and working as it should
Segment Modify Tool is good as it is, but would be great for it to work with capped cylinders and more complex objects like i showed in the video below. I know the topology is more difficult and there might be not elegant solution for this, but maybe you can figure it out. If it is impossible - fine. The tool is great anyway
https://www.youtube.com/watch?v=L6cvaq-8vQw