Great idea, I had thought of taping it or putting a piece of wood under it like a sesaw pedal but I thought the beats would be uncontrolable, but the way you described is perfect.  Of course I have a LP football/diamond type style, can't mount it can't stick my foot in it, but I haven't tried, ... sounds more user friendly than a foot block with a reverse pedal like on a coctail drum...  I was trying to come up with something, this is wonderful.  Thanks for the advise.
As for the Cajon, the spanish style sounds cool too.  I have been shopping ebay looking an pricing.  What is the best kind for versatility and sound?  I have seen pictures but have not see one to test.  They are not popular here yet.  Probably cause Elvis didn't play one.  ...  In Memphis, you show up with a set of congas in a country band and you get some interesting looks from the audience.  Djembes I have seen a few in the college crowd type of place, but no Cajon's.  I was dying to get one and got a Djembe instead.  Another question, related to the brushes.  Don't they make a thing that sits on the drum surface that gingles or creates a buzz like a snare, maybe even designed for a snare?  Or am I just imagining things?  I love thinking of ways to make sounds out out ordinary objects.  ...  I made a shaker out of a rolaids bottle and lentils.  Worked great.  Of course I went out and got an LP shaker when I could afford one.  
I am thinking about getting a Cajon but can't rationalize it cause I haven't been able to see what they can do.  Do you actually play them by sitting on them or can you sit and play them like a conga?  I have seen pictures both ways.  Does it depend on the type  Cajon? or the Cajon-ne?  ... spell check doesn't work on that word...   

  Anyway, I should start a new topic on this.  
Thanks,
Congabebe