So the short answer is: Yes and no.
It's quite easy to adjust the CSS so that attachments show side-by-side, but you'd either need to:
A) Choose a maximum number that can appear side by side before breaking onto a new line, OR:
B) Choose a maximum width that inline attachments can be
The reason is because we need to account for oversized attachments (eg: Huge images) that end-users upload, and force their width values so they don't fill the whole topic space and can sit side by side.
If you're happy with these limitations just let me know A or B above (and the specific values for either) , and also which style you're using