Yes, you can also combine the first two:

$(* $(/ $R_MIN 5) 5)

It would be nice to have a template function that does the padding, but right now we dont have that. In that case it could be like this:

$(str-pad --width 2 --right --pad 0 $(* $(/ $R_MIN 5) 5))

Or something like that. A specialized template function that does exactly this could also br useful:

$(slice $R_MIN 5)

Although the naming can be tricky (I don't think slice conveys the meaning well enough).

Creating a simple template function is not too difficult, just look at the basicfuncs module.

One with arguments is more difficult though.

Bazsi