DB48X: HP48-like RPL implementation for DM42

[grbrum]

@c3d

when typing a variable name, or letter, or even in Symbolic mode "x", i see myself holding shift until ABC comes up, typing the letter and then holding shift again.
I wonder if the DM42 has a hardware limitation that does not allow 2 buttons to be pressed simultaneously.
would it be possible to hold shift, press X (or other letter), then release shift? this would make entry a lot smoother.

another possible idea, if in entry mode, one of the keys could represent X directly,
if I remember right, I think Erable used to do that (was it the DEL key? - I do not remember exactly)

thanks