RT_TABLEID_MAX size

[def]

I very widely using functionality of rdomains and found out, that TABLEID limit 
is quite small. Whether it is possible to increase the size to be at least 2^32 
as is in RFCs 4364 and 4360 which states that RD and BGP target extended 
community fields Assigned number subfield and Local Administrator sub-field are 
4 octets?