Megumin's explosion spell drains her to the point where she cannot move, and she can only use it once a day, but could she move if she had more MP (or whatever equivalent KonoSuba uses) for casting? It could be that the spell cost is defined such that it drains all MP, but there's evidence there's at least a minimum MP requirement, because she was unable to cast it after Kazuma drained some of her MP in one episode, though she wasn't at zero MP. But we see in some episodes Megumin can cast the spell twice if Kazuma uses his drain spell to give her more MP. So, is raising your MP a thing in KonoSuba (I'd think it would be, since it has an explicit leveling and stats system), and could Megumin potentially move after casting her explosion, and maybe even cast it twice in one day if she doubled or tripled her MP?
Do the light novels or manga have any information that would answer this?