There is a sound and the green text, as far as I know. But they have some drawbacks: They disappear after some time, no matter what happens to the bow.. Since you can play Soldat without sound (eg. listen to music instead), but you hardly can play it without video, only a visible indicator will be sufficient. And the problem with the text is, that you don't know when the bow is lost.. ..and it's too big!
What about displaying a 'small' bow-symbol in a screencorner, when the bow is in use??
A continuous symbol is better than state-change-symbols, because you can't miss it, if it's always displayed.
I'm not really confidable concerning rambomatches, so yes, it would be nice to have someone, who actually plays that mode more frequently.