By the way, do you think it would be safe now (with 5.1.3) to switch to the new version - eventhough it's still in Alpha? If I import all my stuff from 4.8 and just keep using v5, is my data safe?
The current release 5.1.3.0 (and the new 5.1.4.0 that I will upload today) it's no more in alpha, so I suggest to change. I will not support 4.8 anymore with new scripts.
Of course you can try to use both of release because are not in conflict.