The answer "can one install a rom via RM when SPR has been suggested" depends on how one looks at the question. If you use RM with CW flashed then using RM to flash a particular rom depends on the developer making his/her rom available via RM. If, however, the developer has not opted to have his/her rom in RM then SPR is the answer. Additionally, if someone has RM installed BUT flashes the alternate recovery SPR then RM can not be used.
Hope this clarifies how the fan boys feel