Remember where you had ended reading help
From Vim Tips Wiki
created 2002 · complexity basic · author Max Ischenko · version 5.7
You could jump to the last place you had been while reading Vim help files if you add this to your vimrc file:
au BufLeave * if &ft == "help" | mark H | endif
'H to go to the mark H.
To work between Vim runs 'viminfo' option should be setup to save file marks.
Perhaps a modification to allow 'H to open another window if a help window doesn't already exist might be useful here. Basically, the problem I had with this was that if i I hit 'H while editing a buffer, it replaced the buffer with the help file (though it DID take me to the right location, as you suggested it would) instead of opening a new window.
nmap <F1> <C-W>s'H