I would like an option to auto-include the indentation of first line for copy-paste convenience,

I find when I copy-paste pieces of code around, I place the cursor usually at the starting word. Then I would hold the shift key to select the lines below. This results in excluding indentation characters of the first line, but including the indentation for the lower lines.

When you then paste this block, you would place the cursor at the correct position, but the lines under that appear 'one level too deep'.

I could work around it, by adjusting my selection to include the indentation of the first line, But old habits seem hard to kick and I find myself un-indenting the pasted code frequently.