Setting shade target level to a variable ?

[TundraSonic]

I want a shade to raise 2% with each button press (it's @ 36 so a press raises it to 38, etc). Typically you'd increment a variable by 2 and then raise the shade to that target level or some objects allow internal math so "set blind target level to blind target level + 2".

I can't figure out either of these or other alternatives in Composer. I can set the blind target level to a specific number but can't find an option for setting it to the value of a variable either in the top level of the shade or within device variables (actually none of the shade device variables appear to offer commands, only conditionals).

Am I missing something?

Thanks,

[jimbones]

Following this thread, I have this exact issue with my Lutron RadioRa2 shades.