In responce to the error Slapdash is getting:
There's no conflict between TweakMonkey and StartupNode that should cause the error. The only thing that will happen is that the last executing script (either StartupNode or TweakMonkey) that sets the startup node (probably TweakMonkey because T comes after S) will override the startup node set by the previous script.
The error(s) Slapdash is getting is/are the "usual" TweakMonkey errors that sometimes happen when MediaMonkey is shut down (and the reason/cure is still unknown).
See the red text:
http://www.mediamonkey.com/forum/viewto ... 9290#69290
Now "Enable/disable setting startupnode" or "Check for active StartupNode script" is on TM's todo (obviously for anyone that wants to implement it).