@Alessandro I agree with you on your P.S. statement about the new UI. Make sure you are running the latest maintenance patch because they have put out a few fixes to improve it's responsiveness. Not saying it's totally fixed, but much better than MP0.
For rounding try setting face priority in the select tool (Ctrl+SpaceBar) then Features Tab and Round command.
i have seen that You also are using ST9.
So please keep in mind, that YOu will be able to save certain settings for dimensions and use them instantly during dimensioning.
So if You want, You can save Your thread settings under the name thread and just use them.
Simple and fast.
Nevertheless I don't understand why You will not us the Feature Callout functionallity.
If Your indent will be to show only the Thread Size then just change it to show only thread size.
It is on You which dimenions You want to show.
And You also can define several standards (user standards) to have both of them, full thread info or size only
I will create sample pictures later on
OK let's talk about the second issue. Rounds and Chamfers.
What I can see when watching Your video is, that You - and this is my personal preferenced methode - should more use the Double-Click
This speeds up Your entrance into the part mode from assembly - Double-Click the part
And then when creating the rounds and chamfers use the RightMouseButton to finalize the steps.
You first select an edge or a chain or a surface or all edges, enter the wanted round radius and confirm this with an Enter, or the green sign or with a simple RightMouseButton Click.
And this RMB or ENter should be done twice.
Why, After selecteing the first group of edges with the first value of radius You can do it again for another set of edges with a different radius, and so on.
This is what I call the expert mode of rounding, but IMHO should not be used as long as people afterwards are not able to see immediately what was done.
OK, will save this post now and will continue with Your next issue in a couple of minutes.
next topic is Cross Section View.
What I have seen in Your video is that You have used the Set Plane Cutting View rather than the Section View
What I have done many years ago was, that I already have created ection Views for the base planes, so that they are within my templates and therefore in every single 3D document I'm creating.
So You only have to turn on or off them without any need for additional steps and clicks
If You will need additional sections - even non linear - then You simply draw the section elements and use thme.
I do not see there to much effort.
And with Synchronous You also have the Live Sections which are much easier to create, to change and to use.
issue 4, taking a measurment
And why are You using the old measurment function rather than the new (ST7) Measure function?
This measure will give You all wanted information and I think the way it shows it to You isn't to bad.
Here a similar situation to Your example