Del should delete visual selection (especially if vi overrides shortcuts option is not selected). I am aware that "d" can be used to delete the selection.
Steps to Reproduce:
1. enter some text
2. mark part of it in visual selection (press v and move cursor)
3. hit Del
selected text is deleted
Git commit 9bb36ec1328f134190dde082db78bda2d0967040 by Erlend Hamberg.
Committed on 21/04/2012 at 09:14.
Pushed by ehamberg into branch 'master'.
Make <del> delete visual selection by default
M +1 -0 part/vimode/katevivisualmode.cpp