I've imported pts wallets just fine into KeyID - here's the method for anyone not sure:
(1) Within KeyID, register your account name, then click on >_Console lower down on the left hand menu
(2) In the text box at the top, below Console, type:
wallet_import_bitcoin "c:\<your_chosen_folder>\your_pts_wallet_name.dat" your_top_secret_password your_keyID_accountname
The question I had was on the use of the File > Import wallet command, which imports a .json wallet. Is this just purely a way to backup KeyID wallet somehow, or does importing say a Bitshares wallet tie a founder account to that KeyID? How can you tie founder ID to KeyID wallet or is that required?