There isn't really anything else that trials needs, maxle is a good idea if you going big but QR is fine for now I'd say. What the whole bike industry needs is more compatibility so you don't have to hunt around for ages for a specific part. I wouldn't say trials is in the dark ages with cranks I mean whats wrong with ISIS, although Hollowtech and others like Truvativ are good. Also post mounts is proberly just another thing to helicoil when you bugger it up stick with IS.