everything you describe besides the singlestep and breakpoints is being worked on. No worries.
Good to hear it - BUT what timescales are we looking at
Depends on how much you contributs ;-)
Unfortunately, no timescale yet. check the jira for progress on issues and file new ones if you encouter them.
3.01 will not take to long, 3.1 a little longer.
you'll have to redo some part of the learning curve for every workflow/BPM product since none of those tools have common foundations. jBPM is the first tool with solid foundations: "Graph Oriented Programming". So your investment in learning jBPM 3 is very valuable. Cause we will commoditize the BPM software with jBPM, based on a solid model. Good foundations is much more important then features at this point. Adding features goes much faster then changing foundations. In a couple of months we will have a complete features set.