Here's an idea for a future version... since the Get MSL button is on the initial screen, there's no point having as a soft menu key. However, the logical next-step once you have the MSL is to launch EPST for customizations, so perhaps the menu key should instead open the the EPST tool... and, if possible, enter the obtained MSL code automatically.
So short version-- Softkey triggers ##778#, (and if possible) automatically selects Edit and enters the MSL code.