I always had a problem with the way the Activity Series was set up. Here's why:
1) It should be set up that once the field trigger opens the Activity Series form, we should be able to choose the times for each activity in the "Schedule Activity Form" that pops up. It should not default as timeless and then have to go searching around in the task list to modify it.
2) The same goes for the "Associate with" field. Each activity should have an "Associate with" option attached to it. Why? Because if, for example, my second activity in the series involves some other company compared to the first activity, then it should be arranged right there before it goes to the task list. Also, if more people are involved in the second activity than in the first activity, the form should have the ability for the user to plan it out a little better by adding people in the Activity Series form.
3) The Schedule Activity form should have the recurrence Options there also. For example, every year my company has a function I have to plan for. Every year I have to do the same things in the same order.at the same time of the year. What good is the Activity Series functions if I have to remember to trigger it every year?
4) Finally, the biggest pet peeve. If I have a dropdown list, the choice I choose in the dropdown list should be specific to the activity series chosen. Even though the activity series can be triggered by a field, it does not trigger to a specific activity for the action chosen in the dropdown list. It's a generic choice trigger. it should be one-to-one. If I choose one activity from the dropdown list, the activity series form should be for that action chosen.