What is your current controller?
I am a LIVE SOUND GUY way the hell before I am a lighting guy. In fact, I'd drop lighting entirely if I could, and I'm using MyDMX just fine, thank you very much. But I also have a DMX Operator. The DMX Operator lets you set a "cross-fade" time, which while not super accurate, should provide more than acceptable results. You do know you're going to have to manage scenes and banks and perhaps some documentation.
I'm adding stuff to my laptop to help facilitate scene changes easier. The first thing is using the laptop's keyboard to quickly access things. The other is adding external controllers to help aid in triggering.
Using this and programming your fades into your scenes, there's no reason why MyDMX needs to be an unecessary distraction. I'm managing 76 channels at once while monitoring and maintaining up to 16 monitor sends, outboard and EQ, in addition to tracking and monitoring multi-channel audio recording and video. Hitting a key quickly on MyDMX isn't a big deal for me.
But if you want a controller, take a look at Jingle's suggestions. I won't give up my DMX Operator, because in case MyDMX fails, I've got my back-up right there. Swing a cable and I'm done.