I read though the thread where you identified the weakness with the current approach - you cannot force a specific pedal state (on or off) using the current HD Midi implementation, only toggle to the other state (on or off). 

I am going to restate here what you found cause it will affect a number of people and I wanted to make clear what the problem you had was - when people come looking.

The issue in your case was that you wanted to be able to to retain reverb and delay trails when changing effects.  Patch changes (via Midi or otherwise) normally cause delays to be cut off hard. 

However, you noted that Reverb and delay trails are preserved when you stay within an HD patch but instead toggle the specific effects off.  Your workaround would have been to stay within an HD patch and instead send a set of MIDI cc's from your Midi footpedal to force a group of effects to be flipped on or off.  This would have achieved your aims.

Unfortunately the HD MIDI implementation does not appear to follow convention.  Typically a cc value of 0-63 means 'off' and 64-127 means 'on'.  However any value (0-127) sent to the HD simply flips an effect to its opposite state (on or off).  Therefore it is impossible to predict and automate the required HD effect  state using MIDI commands, within an HD Patch.

Nick is right - people shouild raise feature requests if they feel that this needs to be changed.