@lol
Bot mods are good if implemented properly. So far, most [or all] of the current bot systems are not fully mature. I would love to see this in action in the future.
HvH can be fun if [as above] done right. Assuming it doesn't kludge over the existing system by, say, providing an option to spawn as aliens and then telling you it isn't allowed (this sort of thing is highly unprofessional); then yes, I think this would be an interesting gameplay modification to try.
@Overdose
Such mods do liven things up, can't argue with that. But it pains me to see people fucking around with tremulous.h without giving thought as to how it'll affect the balance. I suppose my main argument is against reckless coding (CUI: Coding Under the Influence).
Not entirely sure how to respond to your last question. Part of me wants to say "these mods absolutely suck and that's a fact!" and the other "well, I think they suck, but some people might not". I suppose this is a matter of taste.
Perhaps people play on these servers because they make it easier to seem skilled? Getting kills in vanilla Tremulous is damn hard when you're up against more experienced players — rather like a bell curve. Fun/crazy mods make said curve quite a bit shallower. Example: You can just whip out a lucifer cannon and shoot at people from afar with bolts that are, for all intents and purposes, hitscan. (I believe X had or used to have this.) You don't need to be close to fry their asses. With firepower like that, tyrants don't stand a chance, whereas in normal Tremulous, they're matched evenly with a luci/battlesuit-equipped human.
I notice you said !slap is useful for getting players unstuck. Can you give me an example of a scenario where this is the case? I have never, ever encountered such a situation. Not to say you're making baseless claims or anything like that, I'm just a little dubious.