OSPF and mass route deletion

[Andrew]

When routes are deleted (for ex., terminating a lot of PPP tunnels for 
some reason in same time), it seems like each removed route is sent into 
separate OSPF packet that causes troubles with OSPF in some cases (for 
ex., there's troubles with old quagga).

Is there a possibility to add some rate-limiting (for ex., limit to 10 
messages per second), and aggregate separate 'route deleted' messages to 
one packet?