In Vim it is nice to use hjkl in normal mode and would be great to continue to use them in insert mode. I tried to map them to Ctrl-h, Ctrl-j, Ctrl-k, Ctrl-l:
imap <C-h> <left>
imap <C-j> <down>
imap <C-k> <up>
imap <C-l> <right>
but it is not convenient especially because it masks Ctrl-H and backspace stops responding. Have you been able somehow to use HJKL keys for movements in insert mode?