Some have had good experiences with the Kisan Signal Minder.
I had this product on my cruiser. You can set the number of flashes/blinks you want. You then get that number plus any more that happen when a brake is on (like when you are sitting at a light with your back brake on waiting to make your turn). I think 10 blinks is its lowest setting.
A couple of other things you get with the product is the ability to turn your rear signal lights into running lights (on but at a reduced intensity) for added conspicuity. Good idea, but illegal in many jurisdictions because the lights aren't red. You also get the ability to run your signal lights as 4-way flashers (which the Strom already has) or in escort mode (both lefts flash, then both rights flash etc.).
The product sounded neat in theory but in practice there a a couple of problems with it, at least on the model that I had for my Honda Shadow. Firstly, you lose your normal push to cancel feature. In order to cancel the signal prior to it self cancelling, you have to push the turn signal lever in the same direction as you are indicating - and it required a pretty firm push with a slight pause at the end. Secondly you lose the ability to go from signalling one direction to the other direction by simply pushing the indicator to your new direction. To go from left signal on to right signal on, for example, you'd have to push the indicator left, then left again with a distinct pause, then right. That extra step in the middle is a bit irksome plus if you don't pause long enough to cancel the first signal (the left one in this example), the left signal will just stay on until it self cancels (eg after 10 flashes). So then you're turning or lane-changing right thinking that your right signal is on, but in fact the left one is. So after you do that a few times and manage to avoid getting killed, to compensate you start checking your signals to make sure they are working the way you intended whenever you need to cancel your signals prior to them self-cancelling. Plus, on the Honda, this meant looking at the signals themselves since there is only a single indicator light (blinks for both left and right). Either way, at that point, I think rider safety trumps the convenience of the device. You shouldn't be lane changing with the wrong signal on or having to visually check which signal is on before you lane change.
If you are just worried about looking like a senior rider afflicted with Someteimers (as in Someteims I remember to cancel my signal and Someteims I don't) there is a product (BlinkerBuddy?) that you strategically install in your seat. When your signal flashes it tickles your fancy to let you know that your signal is on. This is supposed to remind you to cancel your signal but my wife says that if she had that in her seat, she'd ride around all day with her signals on and a big smile on her face. :rolleyes: Wait til Janice hears about this item!