Let's say I'm doing some adjustments to Amplitude and scale settings, and want the same on all 8 elements.
Possible to copy and paste it easy to the other ones?

You can COPY Elements as follows:
While in Element Edit:
Press [SHIFT] + [EDIT]
This launches the COPY/EXCHANGE function.

The Element currently being edited will occupy the Source box, you can set the target as you require.
See Page 131 of the latest Supplementary Manual

If your question is asking if there is a way to copy only the Amplitude->Scale settings (and not anything else) - then no, there's not a way using built-in keyboard features.

The copy feature mentioned will copy the entire element. Not only Amplitude->Scale.

Software is able to do this - so you could write your own or use 3rd party software (JM tools should be able to cut/paste settings).

If you write your own software, you would utilize SysEx commands to read/write parameters at addresses:

0x41 ep 0x3B-0x45

... where "ep" is the element (0-F) in the upper nibble and part (0-F) in the lower nibble.

As an example, for the 1st parameter in Part 5 element 1 to element 2 you would do parameter reads of:

0x41 0x04 0x3B

Then write to:

0x41 0x14 0x3B

0x04 as the 2nd parameter says e=0 (element 1) p=4 (Part 5)
0x14 as the 2nd parameter says e=1 (element 2) p=4 (Part 5)