actually, kurgan is not quite correct, you can unset g_synchronousclients right after youstart recording, the result is unaffected gameplay and you are still recording.
here is a recording script that i stole from someone else, i forget where, but it will automaically record demos for you, with the press of a button. beware tho, that everytime you start JA, it will record over any demo named demo01, so after you shutdown, make sure to rename all your demos if you want to save them.
// Jk2Bindings
bind f9 vstr startswitch
bind f10 vstr stopswitch
set startswitch "g_synchronousClients 1;vstr rec_demo;g_synchronousClients 0"
set stopswitch "stoprecord; vstr nxt_demo; echo Recording Stopped.; echo Current Queue; rec_demo"
// Cycles 1-20
set demo_01 "set rec_demo record demo01; set prv_demo vstr demo_20; set nxt_demo vstr demo_02"
set demo_02 "set rec_demo record demo02; set prv_demo vstr demo_01; set nxt_demo vstr demo_03"
set demo_03 "set rec_demo record demo03; set prv_demo vstr demo_02; set nxt_demo vstr demo_04"
set demo_04 "set rec_demo record demo04; set prv_demo vstr demo_03; set nxt_demo vstr demo_05"
set demo_05 "set rec_demo record demo05; set prv_demo vstr demo_04; set nxt_demo vstr demo_06"
set demo_06 "set rec_demo record demo06; set prv_demo vstr demo_05; set nxt_demo vstr demo_07"
set demo_07 "set rec_demo record demo07; set prv_demo vstr demo_06; set nxt_demo vstr demo_08"
set demo_08 "set rec_demo record demo08; set prv_demo vstr demo_07; set nxt_demo vstr demo_09"
set demo_09 "set rec_demo record demo09; set prv_demo vstr demo_08; set nxt_demo vstr demo_10"
set demo_10 "set rec_demo record demo10; set prv_demo vstr demo_09; set nxt_demo vstr demo_11"
set demo_11 "set rec_demo record demo11; set prv_demo vstr demo_10; set nxt_demo vstr demo_12"
set demo_12 "set rec_demo record demo12; set prv_demo vstr demo_11; set nxt_demo vstr demo_13"
set demo_13 "set rec_demo record demo13; set prv_demo vstr demo_12; set nxt_demo vstr demo_14"
set demo_14 "set rec_demo record demo14; set prv_demo vstr demo_13; set nxt_demo vstr demo_15"
set demo_15 "set rec_demo record demo15; set prv_demo vstr demo_14; set nxt_demo vstr demo_16"
set demo_16 "set rec_demo record demo16; set prv_demo vstr demo_15; set nxt_demo vstr demo_17"
set demo_17 "set rec_demo record demo17; set prv_demo vstr demo_16; set nxt_demo vstr demo_18"
set demo_18 "set rec_demo record demo18; set prv_demo vstr demo_17; set nxt_demo vstr demo_19"
set demo_19 "set rec_demo record demo19; set prv_demo vstr demo_18; set nxt_demo vstr demo_20"
set demo_20 "set rec_demo record demo20; set prv_demo vstr demo_19; set nxt_demo vstr demo_01"
// set Assignments
set rec_demo record demo01
set prv_demo vstr demo_20
set nxt_demo vstr demo_02
// Sprayed bug free by TF_BioHazard
// May the Force be with you!
//
www.teamfusion.org)