[LAD] preset saving in sessions

[parched2099]

With the advent of NSM, there's a better chance than ever for 
autoloaded sessions when working.

One of the challenges of autoswitching between sessions is loading 
presets for that session. In, for example LV2rack, it starts, but 
presets have to be loaded manually, after it gets going.

Is there a mechanism for LV2rack, and other standalone plugin hosts, to 
have a preset automatically load with the selected preset for a session, 
when that session is selected?

An example is lv2rack with the IR lv2 plugin, which i've been testing 
in NSM. LV2rack comes up ok, but the preset i've built for a specific 
session doesn't automatically load. I assume this is the case when using 
something like LV2rack in other session managers too.

Where would a call for an autoloaded session saved preset come from? 
The session manager, or LV2rack itself?