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ReFreeLook has a single cvar.

afl_admin_access_flags

Access flags that are exempt from the server's forced spectator camera mode (mp_forcecamera/mp_forcechasecam). A player whose AMX Mod X access level includes any of the listed flags gets unrestricted camera control while spectating. Flags are additive — combine as many letters as you want.

Default
d

The flags are the standard AMX Mod X access flags (as documented in users.ini):

Flag	Access
a	Immunity (can't be kicked/banned/slain/slapped or affected by other admin commands).
b	Reservation (can join on reserved slots).
c	amx_kick command.
d	amx_ban and amx_unban commands (permanent and temporary bans).
e	amx_slay and amx_slap commands.
f	amx_map command.
g	amx_cvar command (not all cvars available).
h	amx_cfg command.
i	amx_chat and other chat commands.
j	amx_vote and other vote commands.
k	Access to sv_password cvar (via amx_cvar).
l	Access to amx_rcon command and rcon_password cvar (via amx_cvar).
m–t	Custom levels A–H, for additional plugins.
u	Menu access.
v	amx_ban/amx_unban, temporary bans only (self-performed bans during the current map only for amx_unban).
z	User (no admin access).

Since the default is d (ban commands), most servers will want to add whichever flag(s) their actual moderator/admin group uses — for example:

afl_admin_access_flags "cd"

grants free camera to anyone with the kick (c) or ban (d) flag.