What balance pitfalls result from this house rule regarding levitating creatures?

My table is considering the following house rule:

A creature suspended above the ground and unable to move on its own (e.g., under the effect of the levitate spell) is especially susceptible to forces that would push or pull it. When you successfully target a suspended creature with an effect that would move it, you can choose to move it an additional number of feet equal to 5 times your relevant ability modifier (e.g., your Strength modifier if you shoved the creature with a special melee attack, or your spellcasting ability modifier if you used a magical effect, such as the gust spell or the shove effect of the Telekinetic feat). The additional movement must be in the same direction as the normal movement caused by the effect you used.

A creature with a flying speed is not affected by this rule.

The logic here should be obvious — a creature hanging in mid-air, with no ability whatsoever to stop itself from being moved, should be easy to move. But what are the implications of such a house rule from a balance standpoint? Are we setting ourselves up for headaches?

(For context: this might seem like a corner case, but we’re playing a heavily psionics-themed campaign, and so maximizing players’ opportunities to embody the tropes of telekinesis even at low levels is important. It isn’t inconceivable that someone else in a similarly-themed campaign might have similar ideas.)