hello m8's server admin needs ur help

any1 knows how to make a callvote option that will allow players to switch xp_rotation variable???

and second question. is it possible that pukbuster cvar check lags the server??

this is my pb cfg:
[code:1]
//-------------------------------------- Main -----------------------------
pb_sv_enable
pb_sv_guidrelax 1
pb_sv_CQC 1
pb_sv_sswidth 1024
pb_sv_ssheight 768
pb_sv_scoreKick -10
pb_sv_extChar 1
pb_sv_emptyname 1
pb_sv_cvarempty
//-------------------------------------- Cheats ---------------------------
pb_sv_cvar aim IN 0
pb_sv_cvar glow IN 0
pb_sv_cvar ignorewalls IN 0
pb_sv_cvar pingpredict IN 0
pb_sv_cvar autoaim IN 0
pb_sv_cvar autofire IN 0
pb_sv_cvar ogc_aim IN 0
pb_sv_cvar ogc_bot IN 0
pb_sv_cvar ogc_fov IN 0
pb_sv_cvar ogc_glow IN 0
pb_sv_cvar ogc_mode IN 0
pb_sv_cvar ogc_names IN 0
pb_sv_cvar ogc_wall IN 0
pb_sv_cvar ogc_trans IN 0
pb_sv_cvar ogc_weapons IN 0
pb_sv_cvar cl_punkbuster IN 1
pb_sv_cvar safe IN 0
pb_sv_cvar radar IN 0
pb_sv_cvar mode IN 0
pb_sv_cvar names IN 0
pb_sv_cvar bunny IN 0
pb_sv_cvar nofx IN 0
pb_sv_cvar wall IN 0
pb_sv_cvar shoot IN 0
pb_sv_cvar weapons IN 0
pb_sv_cvar alias IN 0
pb_sv_cvar guid IN 0
//-------------------------------------- Hacks ---------------------------
pb_sv_cvar cg_fov IN 90 125
pb_sv_cvar com_maxfps IN 30 1024
pb_sv_cvar r_shownormals IN 0
pb_sv_cvar cl_packetdup IN 0 5
pb_sv_cvar cl_timenudge IN -50 0
pb_sv_cvar rate OUT 0 2499
pb_sv_cvar snaps IN 10 125
pb_sv_cvar cg_shadows IN 0 1
//-------------------------------------- Bad Names ----------------------
pb_sv_badname 60 UnamedPlayer
pb_sv_badname 30 ogc
pb_sv_badname 30 noskill
pb_sv_badname 30 noname
pb_sv_badname 30 AimBot
pb_sv_badname 30 unnamed
[/code:1]