No recommendation here, since I do not know nor the product nor the developer, but the available documentation provided online for the plugin, and the NN wizard should give you a pretty good idea of the capabilities.
If it is the kind of thing you are looking for, you should directly contact the plugin developer to get more information and to check about the compatibility with the current versions of AmiBroker.
1) This plugin is developed/sold from an INDEPENDENT business that has no financial/engineering or other connection to AmiBroker.com
Regarding NN I think you have to train your network on data carefully first in more specific program and then once you have good prediction ability AFL is dynamic and strong enough to program such network since all the rest is about looping and matrices manipulation and AFL contains plenty of the functions that can deal with that.
BTW, take care of relying on prediction of NNs in stock market unless you train it very well and the deviation of results is insignificant !!!!!