I understand. Thanks for the prompt responses!
I found a german language forum where they successfully kludged it by using an SR FF to get it to work in LTSpice: http://www.mikrocontroller.net/topic/256548
To avoid a long convergence, they used some dreaded "CSHUNT" value that one isn't supposed to use.
I will try to futz around with it to see if I can do the same for TINA.
Thanks!