With the usual disclaimer of "according to my current knowledge", that is virtually impossible. We do can disable spawning on flags for AI bots, but only for the whole team, not for some specific bots like your squad mates or "all but squad leaders".
Anyway, in my experience, it's not that hard to make your subordinates to spawn on you. I even occasionally use the following "camping" strategy: say, you are the leader of a 5-6 men squad. Come close to the target flag, but without entering its flag zone since the defenders will smell this. Keep a low profile and wait for 3+ bots (about a half or more) of your squad to be dead. As soon as it happens, the chances that they all will spawn on you are very high. It may take a while, up to a couple of minutes if you are far away from any friendly flag, but they will come and then you all rush the flag. Overall, my rule of thumb for getting squad reinforcements is: be alive, do not sit in a tight place where bots can't navigate, do not sit in a vehicle with all the seats occupied.