Can I select certain accounts from the bank to download and sync?

Note that if these are under the same username at the financial institution all the accounts might be created/downloaded on the first connection.  (They used to ask, and you could select ignore, but I believe it is now changed that the first time you do it you get them all).  If that happens you can just delete the accounts, you don't want.  Right click on the account name in the Account bar and select Edit/Delete account.  That will bring up a dialog with a Delete Account button.