You need to change your player.cpp around line 3430 --You need to change:
redskullticks+=.
Also, you need to change:
(g_config.getNumber(ConfigManager::KILLS_TO_RED) - 1) * TIMEYOUWANT &&
and
(g_config.getNumber(ConfigManager::KILLS_TO_BAN) - 1) * TIMEYOUWANT
Finally, You need to do a change in commands.cpp to fix the !kills command to display the proper amount of kills. To do this, goto around line 1213:
int32_t kills = (player->redSkullTicks / TIMEYOUWANT) + 1;
**Note that all of these times are in Millisecond form**