Yes. Firstly, when you press the Save Changes button on the Beacon configuration tab, that resets the decay timers so the beacon should be transmitted immediately (or at least within the fast transmit rate, depending on when it was last automatically sent).
Secondly, if you are viewing the main map window and the map itself has the keyboard focus (not the text message fields below the map), each time you tap the spacebar, the beacon should transmitted immediately, and the decay timers will be reset as though you had modified the beacon.
Note that overdoing this will _not_ cause digipeaters or I-gates to forward each of your packets. These stations usually enforce the constraint of no duplicate packets more often 30 seconds from the same originating station.
Hope this helps.
Andrew, KA2DDO
author of YAAC
