The modifiers are available...delete the first strobe that comes up in the default diagram (a modifier is considered a lighting source since you can add it by itself or put a strobe/speedlight next to it to show how it is powered). You'll then see all the others available (except for beauty dishes and panels which are in the full version) via the Add menu item. I've attached an image of most of the modifiers before I ran out of space on the diagram 
It does a lot more than strobox: lots more modifiers, annotations, power ratio annotations, gels, configurable grid, and more space to lay out more complicated diagrams. Can't compete w/ strobox's "free" model since they seem to be trying to make their money via subscriptions on their community web site which I didn't think was very useful (at least I've never heard of anyone using that or lightingdigram.com's community site). The user base for Android is *much* smaller than iphones which most photographers use. To date, only 200 people have installed the Lite version and zero have paid for it, so even ad revenue is pretty much worthless...which makes me wonder if developing any more photography apps for Android is worthwhile 
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Pentax K20D, 77Ltd, 43Ltd, Sigma 17-70, 60-250/4, crapload of Strobist gear (SB28's, RP JrX Studios, Einsteins, WL, Speedo BD, softboxes, grids, etc.)