Vim enable mouse scroll only - not cursor positioning

Solution 1:

You can selectively disable mouse buttons by mapping them to <nop>. For example, to disable the left mouse button:

:nmap <LeftMouse> <nop>
:imap <LeftMouse> <nop>
:vmap <LeftMouse> <nop>

If you also want to ignore double clicks:

:nmap <2-LeftMouse> <nop>
…

See:

:help gui-mouse-mapping
:help map-overview