vi doesn't seem to be part of busybox. Am I missing something?

busybox-base_1.8.1-1_mipsel.ipk
busybox-links_1.8.1-1_mipsel.ipk
busybox_1.8.1-1_mipsel.ipk

Busybox has the following commands :
# ls
[ date gunzip msh sensord umount
ash dd head mv setfacl uncompress
attr df hexdump ping setfattr unzip
bunzip2 du kill printcmd sh utelnetd
busybox echo killall printd sleep uuencode
bzcat env ln printjob sync wc
cat expr login ps tail wget
chacl false ls pwd tar wipedisks
chmod free mkdir rcsysver test zcat
chown getfacl mknod rm touch
cp getfattr more rmdir tr
cut grep mount sed true