Cristoph Kemper said some time ago that fixing the aliasing would be no problem, but would require to speed up the algorithms, and he was hoping to save the processing power for future features. So the computing power is indeed to be treasured
Actually it was fixed back then on the next firmware update after he posted that (1.6.1 I believe), so at that time they did make the algorithm more intensive to solve the aliasing issue and now the CPU cycles are being used for this rather than other effects right now, so the scope for further improvement is probably non-existent at this point
Are you 100% sure the aliasing effects you're hearing aren't pickup warble and frequency interference? A real amp will give the same results in this case.