My friend shows her standie in speed events. He is a rtired trotter (not a pacer) and does pretty well. It took a lot of work, because a lot of standies have trouble with lead changes. It's just not natural for them! As for build, the build is SO different from horse to horse, bloodline to bloodline. Yes, they are built for speed, but for speed on the straight away - more go than whoa. One thing most standies have going for them is their work ethic. Most are hard working horses who give their all and try so hard to please.
Do you have a standardbred? Many states/provinces have standardbred shows. You might want to look into that. They are a great way to connect to other standie owners. Try the USTA website.
My friend has a 10 year old ex-pacer. He's never really had much issue with lead changed and stuff. He's been getting trained in bending and other gymkhana games as well as for show jumping. Ever since he was able to actually canter properly and was going well bending trotting, when he started bending at a canter most of the time he was flying changing himself.
He's been to a few gymkhanas and has done well. His first time out he came like 3rd overall.