Do you mean you want to make it update multiple params simultaneously or do you mean you want to make it so it can re-target which single parameter it is working on?
If you're trying to re-target, you could use an onclick or onmousedown script and call ogscript.putObject('MY_ACTIVE_PARAM', 'OID_OF_PARAM_TO_UPDATE'); and then use var oidTouse = ogscript.getObject('MY_ACTIVE_PARAM'); when you're applying your punchpad changes.
If you're trying to select multiple, I would recommend an integer array of toggle buttons (or check boxes) you could put beside each param you wish to update. You could then check the status of each checkbox when applying your punchpad changes to see if you should update each param.
If you need an example of what I'm talking about, let me know which approach you're trying to do and I'll see what I can do.
Best of luck.
James
#DashBoard