Related to this, but a bug, not a wish:
When a path exceeds 260 characters, the known message appears informing that the path exceeds 260 characters. After pressing OK, a “object reference not set to an instance of an object” message appears and then another message saying that RC has crashed and if i wish to send an error report. I tried it a 2nd time and the crash didn't happen but the “object reference” message did appear again.
I know your intention is to eventually support paths longer than 260 chars but since this will not be supported in v4.0, it might be nice to check what’s happening there, before the final RC4 release.