I don't know of an existing single component that does this, but the pipeline does support the idea of 'seek by amount of time' events and there is a 'queue2' element that holds a defined block of time, so maybe there's a way to arrange something with a queue2 (or several of them) and an element that just generates seek events (maybe you write an element/component that injects left/right arrow events and you just use navseek to make those into pipeline seek events?)

If you elect to write a full-on windowing component, I'd suggest you consider a data structure to support a multitap buffer (I've needed that in previous endeavors). That is, one list of data objects O_n, O_n+1, O_n+2, ... , O_m and the ability to get output streams on slices of that list as the data shifts through - like a T with with outputs on list-locations instead of on the single data element in the current "tee" ... it would be a 'sometimes' pad I could ask for by indicating the delay as a parameter in the mimetype, in either time-delay or in samples-delay. With a multitap-delay, you could also easily run the overlapping analysis parts in parallel.