One approach is to just convert all your entities to characters, do the spell check, and then convert them back to entities if needed. Of course, you don't have to do this by hand with 0.6.0 - you can create a Saved Searches group to do it for you. The examples included have a group with several of the blank space to show how it can be done.
It takes a bit to enter them, but do it once and its done - and if you export the group to a .ini file you can share it for others to use. A list like this could be scripted - maybe something I'll look into - the issue is deciding what lists to use (seems like 'everything' is needed, grouped appropriately).
There's also a request to add all special characters to the special characters dialog so an external character map wouldn't be necessary, but that may or may not get done.