Anti-lag on 32 bit ECUs has been attempted by some of the best. I have some maps that sort of make it happen but the results have not been marketable. For 16bit ECUs there is code that has been adapted and it includes speed density. The anti-lag function is moderate.
I do have tunes for speed density only on 32bit ECUs. They work well.
The ultimate solution is a full plug and play stand alone ECU. So if your really serious and have about $2500 to spare we can get started.
If anyone ever works out anti-lag on the stock 32 bit ECU they will be forever known..Its like the holy grail for the US STI. It can be done it will just take the right motivation to do it. I would pay dearly for even a piece of the code if anyone can show me it.