we can decrypt our Digital Signature on our own NAND backups only w/ the xorpads if its dumped beforehand, but we cant Re-sign it w/o the ability to forge that signature it even if you went out of teh way to surface-mount solder a larger capacity NAND chip it'd be pointless + all digital content is designed to only to install to SD or in DSiWare case only to TWLNAND (it maybe albeit pointless, possible to redirect twlnand storage to SD for more DSiWare, however.. to be honets a good chunk of the DSiWare library was shovelware. )
w/o altering how digital editions of games install and make em install to CTRNAND instead no ones going to really look into any kind of way to make this possible at all. its a case of too much effort for too little gain.
and if you ask "Why not make it so we can use whats allready available? you haveto realise the 3DS NAND in the case of an O3DS is roughtly under 1GB and N3DS is just lil over that. it' dbe enough to toss some small VC's but not Any actual game.