"Press 1 to be connected" option in IVR a viable way to filter out robo callers?

Are robo dialers capable of pressing keys to advance through IVR menus, and if so, do they tend to follow any specific strategy (e.g., spamming #)? Here are two pages I found on the subject:

http://www.dslreports.com/forum/r28715445-How-I-stop-telespammers-dead-with-voip-ms-IVR

https://robocall.devpost.com/submissions/11020-hi-it-s-me-ivr

I tried to set something up like this, but I am running into two problems:

1. My main number does not allow routing to my IVR menu, only to the auto-receptionist. My second and third number can be routed to my IVR menu.
2. My business partners and I take shifts answering the phone. It would be a pain to go into the IVR menu settings every time I need to change the extension over to someone else. Is there a way I can funnel the IVR into somewhere where the destination extension can be changed very quickly?

Thanks.