That is guys not gays ..... ok you will add
NapalmNade plugin to your server and add this cvar in amxx.cfg
napalm_affect 1
napalm_override 1
and other cvars as you want
FrostNade plugin also add this cvar
fn_override 1
fn_nadetypes 4
and other cvars as you want, Tested and worked like what you want
HE --- NapalmNade
Flashbang --- Flashbang
Smoke --- FrostNade