Basta prefixar o comando gt
com um número, por exemplo:
4gt
Por conveniência eu tenho Alt + 1 através de 0 mapeado para pular para as abas correspondentes (coloque isso no seu vimrc):
" Meta+1-0 jumps to tab 1-10, Shift+Meta+1-0 jumps to tab 11-20:
let s:windowmapnr = 0
let s:wins='1234567890!@#$%^&*()'
while (s:windowmapnr < strlen(s:wins))
exe 'noremap <silent> <M-' . s:wins[s:windowmapnr] . '> ' . (s:windowmapnr + 1) . 'gt'
exe 'inoremap <silent> <M-' . s:wins[s:windowmapnr] . '> <C-O>' . (s:windowmapnr + 1) . 'gt'
exe 'cnoremap <silent> <M-' . s:wins[s:windowmapnr] . '> <C-C>' . (s:windowmapnr + 1) . 'gt'
exe 'vnoremap <silent> <M-' . s:wins[s:windowmapnr] . '> <C-C>' . (s:windowmapnr + 1) . 'gt'
let s:windowmapnr += 1
endwhile
unlet s:windowmapnr s:wins