If you're going to make the plugin 1.10-only, you should consider using the new functions available in 1.10:
- register_cvar + get_pcvar_* => create_cvar + bind_pcvar_*
- register_event => register_event_ex
- set_task => set_task_ex
- replace_all => replace_string
- "%n" directly in the message instead of "get_user_name"
- The "body" argument in "get_user_aiming" is no longer mandatory.
- Same goes for "menu_item_getinfo" - all arguments are no longer mandatory. Only the first 2 are.
- Multilingual menus. In 1.10 "menu_create" has an additional argument that makes the entire menu use language keys instead of normal strings. There is no reason for you to format a %L string manually.