If you're running apps outside the shell command line that will always run with your UID, you can create session-wide environment variables by adding them to ~/.pam_environment, rather than .bash_aliases.

If you're running apps outside the shell command line that will not always run with your UID, system-wide environment variables by adding them to /etc/environment, rather than .bash_aliases.

However: Creating system-wide environment variables will affect ALL users, including root. If the variable you set overwrites another, bad things will happen. Adding something onto the end of PATH doesn't seem like it will cause any havoc, but seeing as you don't have root, you would need your sysadmin to do it for you, and s/he can probably advise you as to whether it is safe to add it. Whether s/he actually allows you to do this is something else entirely; anything user-related is best kept within the config files within their home folder, and it is not normally 'done' to have a users configuration affecting the whole system!