I think, this is the closest you can get?
Suggestion 1 (how strong are your objections, 0=ok, 1=concerns, 2=strong objections)
[poll type=number min=0 max=2 step=1 public=true name=test][/poll]
Suggestion 2
[poll type=number min=0 max=2 step=1 public=true name=dd][/poll]
no-action solution (how strong are you objections, when all suggestions are droped)
- 0
- 1
- 2
0 voters
And then users can add other option by replying.