Hello. We are working on a new release NOW that will be out by September, released as 2.7. It has many major enhancements, one of which is JEvents is becoming optional. DT Register will run completely on its own, including having its own frontend calendar options.
For now, while there are two components, there is NO double work being done. You enter the event name, date and time in JEvents. That's it. None of those 3 items are entered a 2nd time in DT Register. So you setup events in two places, but really it's no different that just having two different admin pages of the same component. Not a big deal. Yes, doing upgrades for two components is a little more work, but when upgrading DT Register currently, you don't have to make changes to JEvents... so it's generally very painless.
But anyway, yes, we are moving JEvents out... and probably not soon enough