A lot of people get pusher fans and put them on the front. Or, maybe you have enough room for a slim fan.

Are you talking about mounts or the inserts? I only put the front two inserts in, and I noticed a difference. Power transfer seems more direct and responsive. I'd imagine the effect would be more pronounced if all three inserts were in, or if the stock mounts were replaced alltogether with polyurethane mounts. For $25 or so, the inserts are cheap and you'll notice the difference. I think NRG Racing makes complete front torque mount replacements that look pretty nice, I think they run around a bill or so.