we can't do anything, this need a modification in the core files, and we didn't encourage the core files modification or hacking .
after the renewal price option, the next step i think is the unification of command in all domains modules, like getNameservers() , setNameservers(array $vars = null), getWhoisContact($type = 'all') , getEppCode(), setEppCode($epp) .... something like that .... or the second option that i can think about is to create a new module called for example domain manager, inside the module the option to add registrars and then extend the module command from the registrar class, the same login as modules with their functions, but finally Blesta who decide what is the best .