Hi!
I looking for packets used to change team... i found it but it didnt work
But i found something else
If u want to change ur scout to medic u can do it without wait

What u need to do:
Run WPE and record before u respawn.
Stop recording after respawn
U should have 1 packed send (38bytes)
Add it to send (like heal hack)
Edit it and u see something like that:

0000 F0 F3 F3 F3 F3 E3 F1 E3 F2 F2 E3 F1 E3 F2 F3 F6
0010 E3 F3 E3 F3 E3 F1 E3 F3 E3 F3 E3 F3 E3 F3 E3 F3
0020 E3 F3 E3 F3 E3 C9

Now u have to edit 16(h) byte it is marked red.
Change it to:
F0 - Combatant
F1 - Eng
F2 - Medic
F3 - Scout
F7 - Havy ... (Panzer)

Now colse it and send 1 time.
DONE u have now other class