[1] On my current site, I already have a user/admin set up as "tayluca" so when I import the threads, will it associate the threads imported with my account or is there anything odd I need to know about importing threads/accounts for people who's accounts have already been created on my dkpsystem site?
Nope. Nothing will be overwritten or replaced if the account exists already on your DKPSystem site. If there is an account with a different name, but using the same email address, the posts will automatically transfer to that account, rather than creating a seperate account.
[2] I have accounts on my current site that have varying arrays of membergroups. For these accounts that will be imported, what permissions will they have at first? Lowest level security? Will I then need to go through for each account and tell it which rank it should be and manually associate each account with a toon?
Because the group paradigm doesn't convert directly over, all accounts will be given the minimum security on your site.
[3] I have a HUGE number of members on my current site, many of which are now obsolete but we've kept them because there were just so many that I slacked and haven't pruned them. If I do the import, and THEN delete the accounts, will the threads associated with them be deleted or will they remain intact for continuity/history sake?
The threads will indeed remain.
Thanks so much for taking the time to respond and I hope my original post wasn't offensive in its tone, that wasn't my intention.
Absolutely! Your post didn't sound hostile in any way, it sounded "inquisitive." Admittedly the documentation is a low point on the site, and something that's always trailing behind the functionality.