The dialog seem ok for me but it would be more catchy if you put OK button a little bit down(like the cancel button) and maybe the frame can be resize to match the second frame.

The code can be shorten and have a little 'makeup':
on @*:OP:#: {
if (%Enable == on) && (%OP == on) && ($opnick != $me) {
.mode $chan -o $opnick
.msg $chan [4Bitchmode] Halfop Protection (Lifes a bitch)
}
}

However IMO this is not so useful but perhaps someone would think otherwise :)