I am also using Heisig's Remembering Simplified Hanzi and second this idea.
To help with my studying, I have created a user dictionary containing Heisig mnemonics, and flashcards to display RTH1 and RTH2 badges on the definition screen.
One limitation of this approach is that entries have to be repeated for all the different spoken variants. e.g.
着[著] zhao1 #536 -ing (RTH1.20)
着[著] zhao2 #536 -ing (RTH1.20)
着[著] zhe5 #536 -ing (RTH1.20)
着[著] zhuo2 #536 -ing (RTH1.20)
The ability to have 'character only' dictionary/flashcard entries would avoid this duplication. Displaying this (and the badges) on the CHAR page would be a bonus.
[And BTW, if there ever was an option to get the complete Heisig content inside Pleco, yeah i would pay for that!]