As an user who develops a (complex) web monitoring scenario, I would like an interactive editor for scenarios that allows me to create and modify steps with an immediate way to (re)play either the whole scenario or single/multiple steps.

The reason for this requirement is that right now developing web scenarios against e.g. CMSes or other high-complexity systems is very time consuming and error-prone, as one has to verify if a change works by:

1. doing the change
2. saving the step
3. saving the scenario
4. wait for the next run of the scenario (and if the scenario is running on a proxy, either wait for the 1h cache expiry or manually refreshing it with `zabbix_proxy -R config_cache_reload`)
5. hoping that the change worked
6. if not, either manually debug it using packet inspection or whatever logging mechanism the target system has, or by wading through hundreds of megabytes of TRACE level logs
7. re-open the scenario
8. re-opening the step

An interactive web UI editor can cut the time needed for verification of a change from 5-10 minutes to mere seconds.