I'm one of those who like "vi", and just hate the stunted version that's provided for in busybox. Using OpenEmbedded, the solution is simple: just build "vim" and install it. This worked just fine on the powerpc version of OE for the 7020, but failed during configuration on the 7025. By applying the following patch, "vim" will build on the 7025 also:
Diff
--- org.openembedded.dreambox/site/mipsel-linux.orig 2006-02-18 12:35:31.000000000 +0100
+++ org.openembedded.dreambox/site/mipsel-linux 2006-02-18 12:36:44.000000000 +0100
@@ -1,6 +1,7 @@
ac_cv_c_littleendian=${ac_cv_c_littleendian=yes}
ac_cv_c_bigendian=${ac_cv_c_bigendian=no}
ac_cv_have_little_endian_long_long=${ac_cv_have_little_endian_long_long=yes}
+ac_cv_sizeof_int=${ac_cv_sizeof_int=4}
ac_cv_func_getpgrp_void=${ac_cv_func_getpgrp_void=yes}
ac_cv_func_setvbuf_reversed=${ac_cv_func_setvbuf_reversed=no}
A better patch would probably be to fix the configure script for vim, but that's a lot more work 