about dvars

i got an .iwd mod,
but its with allot of functions and i want to ask something about it.
is it possible to make an iwd mod that give me only esp/boxes
and will u see that in the killcam??
and do i need to be the host for that,
and will it effect my iw4mp.dat?
tnkx

1. yes its possible
2. ye ppl will be able to see them in killcams
3.yes u need to be host for it
4.i dont think it will effect ur iw4mp.dat