I am evaluating Ui.Vision as imacros alternative for our company.
By default, iMacros is going to wait up to 6 seconds for an element to appear, before it gives up with an error. It will try to find the element every second and it will fail after 6 failures.
The ui.vision wait logic for selenium-ide -style command like CLICK or TYPE works exactly the same as the iMacros wait logic. The only difference is that the default wait time is 10 seconds, not 6.
If you are looking for a direct replacement of imacros WAIT (hardcoded waiting), then use PAUSE.
In addition, ui.vision as very useful visual waiting commands like visual Assert - they wait for an image to show up.