Disallow ring use and kickstart accel before starttime

src/k_kart.c

@@ -9808,7 +9808,8 @@ void K_MoveKartPlayer(player_t *player, boolean onground)
 			|| player->rocketsneakertimer
 			|| player->eggmanexplode
 			|| (player->growshrinktimer > 0)
-			|| player->flametimer))
+			|| player->flametimer)
+			|| leveltime < starttime)
 			player->itemflags |= IF_USERINGS;
 		else
 			player->itemflags &= ~IF_USERINGS;

src/p_user.c

@@ -3834,7 +3834,7 @@ void P_PlayerThink(player_t *player)
 	}
 
 	// Accessibility - kickstart your acceleration
-	if (!(player->pflags & PF_KICKSTARTACCEL))
+	if (!(player->pflags & PF_KICKSTARTACCEL) || leveltime < starttime)
 	{
 		player->kickstartaccel = 0;
 	}