Hi Tom,
Ah the good old days! Back when I worried about having too much cash!!
Unfortunately I was not AIMing in those days :-(
I do think however that a modified Vealy concept could be useful; Book the sell as if it had occurred and enter the sell as a stop-loss with your broker. You can then up the stop loss limit as you go along.
A second advantage is that if you have a stop-loss sitting, and AIM wants you to buy, you can make the buy without paying commissions!. Simply reduce the amount of shares to sell on the stop-loss, and book it as a real AIM buy.
For example one could think of "enhancing" AIM with the following rules (Bernie, please click "next" VBG):
A first two sells after a buy are always implemented directly.
The third (and further) sells in a row is then implemented as a stop-loss sell.
Of course the same can be applied to the buy side as well.
Best,
Rien.