you can stop runaways by adding a "move forward" line in your IWT macro.
E.G

UP (or W key)
Assist target line
Interact with target line
Action Key line (ability)

Alternatively you can add a whole new step into your macro
E.G

Step 1:
Assist target line
Interact with target line
Action Key line (ability)
Step 2: Do not Advance for X seconds
UP (or W key)

There are many ways to do it, but all of them involve implementing a movement key step into the IWT macro. If you search these forums for "stop runaways" you'll see pages of talk and solutions. If you watch videos like Elay's and Mrai's on youtube you can catch discussion/glimpses of their macro's and how they do it.