Adding querystrings

[eluser]mattalexx[/eluser]
The problem with the whole "/controller/action/param1value/param2value/param3value" thing is, the parameters do not have keys and so flexibility is lost (what if I wanted to include param3 but not param1 or param2?). It would be cool if I could do something like this:

Code:

/controller/action/param1value/param3key:param3value

Or maybe this:

Code:

/controller/action/param1value?param3key=param3value

What's the best way to include variable parameters without making my life too difficult later on?