It’s not just the developers - SiWi themselves have admitted that the Target Management in the current DeveloperStudio (aka M2MStudio) is fundamentally broken.
A major re-work (“refactoring”) is under way.
I have never used RTE mode in M2MStudio, and hadn’t used it for ages with the old tools - there were just too many restrictions and deviations from normal behaviour.
eg, see: Quick Timer Question - #8 by awneil
The Debug configurations from M2MStudio work perfectly well as-is with the old TMT and TE - no special setup is required.
I don’t know how you’d go about getting the docmentation for TMT & TE - your best bet is probably to speak to your Distributor or FAE…