First you establish an action step that changes the state of that key map to off.
Then you make a second step which changes the state back to on... but you click the little arrow down in the bottom right of the ISBoxer window to open the Action Timer Group window and make that particular step delay by the time you choose.
I would just load up my setup and check it out. Until I post an actual guide, you can load my .xml file. All of my mapped keys have really detailed descriptions.
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