Well, robots are easy to keep away
In theory, not necessarily in practice. I've had to firewall a bunch of chinese crawlers that don't respect robots.txt and which started to re-index the whole site daily.
If it gets hard on the server, you can always add captcha for anonymous downloads and/or other limits later.
I'd consider a captcha, but I'm currently not sure on how to implement that in drupal in such a manner as to not make the whole process very cumbersome.
I hear your argument and will consider it, but for now I'm going to keep things as they are in re logins. Which, as said, is also the common practice for how sites like these are set up.
Also, I've tested the clothes system as you may have noticed. Everything seems to work alright, but editing one's submission once it's submitted is still kind of shaky.
How so? Does it fail?
Of the features, I miss an ability to upload several files of the same type. For an instance, it's not rare at all for one .mhclo file to have several corresponding .mhmat files, several textures, several thumbnails etc. Eventually, ability for community members to add tags to their own or each other's work would be in order as well, as the collection grows.
These are very good points which I hadn't thought of. I'll see what I can do about these. One problem in the matter is that there's no easy way to add a linked-tables kind of structure to a drupal content type, so I'd have to provide a fixed number of material slots (maybe three or so?). Well, "problem"... It's ugly, but not really a problem.
Also, I'd like more possible licenses (my personal favorite is WTFPL, I tend to slap it onto everything I do), but this is probably low in the priority list.
I'm open for suggestions on licenses, with the limitation that I want to avoid licenses which are either hard to understand, viral or restrictive.