DISCLAIMER!!! Before we get started, I have to warn you... this may not be a good idea depending on what your application and goals are as this method will result in the possible loss of integrity for family type sizes!!!
This method comes in handy for block and stacking of masses for the purpose of laying out relationships of departments in a large facility... so... that being said, let's get started:
Most people like the convenience of stretchable grips. But it is a good practice to use type parameters to control the widths and lengths of elements that need to resize together. Here's how you have have the best of both worlds and it is silly how simple it is:
Draw an extrusion and place a dimension along the width that you want to control. Add a label to this dimension and name it InstanceWidth.
Then create a new length parameter and name it TypeWidth.
Set the formula for this parameter to = InstanceWidth.
Now you get the convenience of grips, but the power and honesty of a type parameter.
Tell your friends or better yet... the cute girl sitting at the end of your favorite bar, you can thank me later.