but it really seems some times that Mathcad's limits are easily reached...
Sometimes that is true. The really sad thing about this is that it did not have to be true. All of the things we have been asking for year after year could have been implemented if PTC had decided to put their resources into them. Instead they decided to create Prime, so instead of going forwards in capability we have gone backwards, just so that we can have (in their opinion) a better interface.