This Management Pack provides tasks which can delete any Work Item in Service Manager (IR, SR, CR, MA, SA, RB etc..).
SMLets is not needed. The task uses the native powershell provided by Microsoft. It checks in registry the installation path of SCSM to load the module PowerShell Service Manager.
Management Pack in ENU and FRA. Feel free to add your own languages inside.
NB: It could only delete items one by one.