Hm.... I also miss situation when we need to pass value. This is bad solution.
I can propose next two solutions:
```node-debug --nodejs "--harmony --max_inlining_levels 6" test``` - pass as string
```node-debug --nodejs --harmony --max_inlining_levels 6 test``` - split by ```--nodejs``` (I don't like this way, but you propose it in target issue)