It's typical behavior that everyone who uses Interact with Target deals with -- What you describe is not specific to ISBoxer only.
I don't have a step-by-step answer for you at the moment, but I can point you in the direction of what you need to become familiar with in ISBoxer in order to achieve that setup:
http://isboxer.com/wiki/Click_Bar
and/or...
http://isboxer.com/wiki/Repeater_Region
and/or...
http://isboxer.com/wiki/Video_FX (this is the least ideal method of accomplishing what you want, but since you're only playing two characters at the moment it's definitely possible to use VideoFX)
and after ISBoxer 41 is released (or you can join the beta test group)...
http://isboxer.com/wiki/Menu
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