I know, this is probably never going to be implemented due to its fantastically difficult nature and limited uses, but perhaps this is something that could be considered in a few decades or so. 😛
Would a "sculpting tool" of sorts be even possible in the MECABRICKS workshop? For example it would make, say, in-MB terrain far easier to construct than building it up piece by piece by piece by piece by piece... Or it could also be used for giant sculptures akin to some of the retired LEGO™ busts. Or even other uses.
It's definitely too complex to implement reasonably in the workshop for a very long time, and would probably be quite slow on all machines, creating unnatural lag in the websites functionality, and is likely not too high on most people's (myself included) wishlists, but it could be something to consider for MECABRICKS version 58.9 released in 2045. 😛