Tactical Movement has been available for double Panzerschreck Panzergrenadiers in Ostheer's Lightning War for ages, and it never caused any problems. Mainly because if you'd actually bother to test things, you'd have noticed that the Schrecks tend to behave badly (models rotating instead of firing) while sprinting.
Good find, but i hope you noticed panzergrenadiers are significantly more expensive, come later, you cant use them as your baseline infantry and have 4 models, making them vulnerable to things like, for example, 75mm sherman.
As for shrecks performing badly while sprinting, it doesnt seem to be the case when you "a click" your pgrens blob in general direction of enemy tank. From what i saw its pretty common strategy in team games.