Yes Sming I used the RCE with my MCU Pro but…it is´t very unintuitive.
I mean on the Mackie Control I have to press 2 Buttons to control an Instrument.
1.Instrument
2. Page Up to go to the First RCE Page
Then I want to control an Insert Effect and have to press 3 Buttons:
1.Insert
2.Select Insert Slot
3.Page Up to go to the first RCE Page
For me it is too much for a good workflow!
The better Idea would be to have an MCU Control Mode (for example the Instrument Button on the MCU) and then the MCU gets the parameters of the editor window which is in focus.
This could be an Instrument or FX.
In this case you only have to press Page Up/Down on MCU for switching the Remote Control Editor Pages of 8 Controls of the focused Plugin (FX or VSTi) you work with.
In this case a second button (for example the Insert Button on MCU) would be neccesary to lock the controls to the last plugin.
Then you can have an other plugineditor in focus but can control the last in background.
This would be the greatest control addon for me in the future.
And please let the RCE be available in Generic Remote , with more than 8 controls 
… because I want to control 3rd party Insert EQs with 14Bit precision from my BCR2000 with generic remote.