Routing issue WithCheckpoint and Cisco ASA 5505

172.21.19.1            172.21.19.5
Checkpoint NG -------- Cisco ASA5505
Internal Net                  |
172.21.19.0 /24            |-----172.16.10.0 /24 (site to Site VPN)
DG 172.21.19.1            |-----172.20.10.0 /24 (site to Site VPN)
                                |-----172.22.17.0 /24 (site to Site VPN)
                        

<client> 172.21.19.30 -----------> <host> 172.22.17.20


to be able to that we have to add a route on the client

add route 172.22.17.0 MASK 255.255.255.0 172.21.19.5 and it works fine.

but i was wondering if there is any other way of doing this without adding static route on every Workstation
perhaps a setting change on checkpoint.

any ideas