Can a Load balancing Router help do some static host or service based load balancing ?

Depending on the model of the load balancing router you use, you may be able to statically partition your hosts and your applications to use a specific internet connection. Please check the feature list and/or configuration guide of your router 

For eg., you can always make a router use a specific service use a specific connection. For eg., you may have both ACT and Airtel connections, with BitTorrent, Tele-presence & videoconferencing applications use th ACT connections (uploads are not counted), but other applications continue to use the Airtel Connection. 

You may also use such routers to partition your WEAN (internet hosts) which are only accessed using specific connections.  For eg., you have 10 GB free Airtel Wynk data on Airtel BB connection and so you want all wynk access to go only through the Airtel connection (irrespective of client device) , while other applications can use either Airtel or ACT connection. 

The following is an enterprise diagram. You can partition your LAN network into segment s like CCTV, office device, personal devices, kids devices, wife's devices and so on and make them use specific connections.

- Suman Kumar Luthra @ APRC-P3 Telecom Sub-Committee