Reducing checkout timeout below 60 mins?

Is it possible to reduce the checkout timeout period to below 60 minutes? It’s too long to leave sales pending for an hour when we have popular events that are nearly sold out.

I’ve found that I can increase the default timeout period (in Settings.. Advanced) but when I try to reduce it it just springs back to 60.

My tech-savvy colleague can’t find an easy way to do this without seriously messing with the StageShow code, which we really don’t want to do. If there isn’t an easy way to reduce the timeout now, would Malcolm be willing to change the code to make it possible?

We’re using Stripe as our payment gateway, if that’s relevant.