Lead Time Based on Percentages

Right now lead and lag time on Wrike dependencies can only be set in the value of days but we have use cases where it would be valuable to set the lead time by a percentage of the previous task. 

For example, we have a series of internal check-ins that don't begin until 50% of the way through the previous task. That initial base task varies in length from project to project so the lead time on the dependency has to be manually updated for every project setup. If I could do 2SS + 50% as opposed to 2SS + 15d, then I wouldn't have to worry about if the '15d' is updated to always be half the duration value of the former task. Sometimes that base task will be 30d but other times it might be 60d so I would like a way to set our blueprint to use percentages as opposed to a set number of days for lead time since that isn't applicable to every project.