Bad: Why the bomber?
I'm surprised you of all people are saying this!
Actually here's my personal opinion on when you should give unusable bombers: If for example you have something like X of every skill needed (or provided) except the bomber, on a 100% level, include the bombers for consistency. Or even if most skills are provided, don't necessarily exclude the bomber. I think it also depends on what skills are available. If you have climbers, floaters, blockers, and builders... then put in the bombers so you get a continuous chain. If you have miners and diggers only, it's silly to include the unusable bombers. If it looks bad without the bombers, include the bombers (since you know it doesn't matter). If it looks bad WITH the bombers, then don't include them (since you know it doesn't matter). Purely aesthetic, but this is partly based on how bombers are provided in original Lemmings/ONML, and it's a simple guideline to follow...
Hmm, tseug's or geoo's... well tseug, you are around, and your pack should be in more recent memory; then again you probably got a ton of feedback on your pack already. It doesn't matter too much for me, I don't really have much time to spend playing levels and reviewing at the moment, but I will host the screenshots for whatever pack is decided on.