NAT pool using BITMASK option !

[Juzam]

I am a long time user of PF on OpenBsd…

and we use these box to nat many overlapping network (that use the same 10.x.x.x/8) network...
we use the "bitmask" pool option to hide one /8 behind another....

EX: 10.0.0.0/8 for client A become 2.0.0.0/8
      10.0.0.0/8 for client B become 3.0.0.0/8

I know all the problems that this solution could bring but it is the only onlyway to make our tools working for many clients....

what i want to know is:

is there a way to do similar thing with PFSENSE (i mean the "bitmask pool option") ?
if yes, how ?
if no, is this planned in future version ?

PFsense is a great tool and it will be great if it can fit in our environment....

thank... and sory for my bad English !!!!