Hello again @soichih
I just wanted to give you an update to this, and something myself had forgotten about.
It is possible to create .tlclient file with configuration paramters.
Any name is accepted, but the file extension .tlclient is recommended. The Windows, Linux, and macOS packages configures the system to automatically recognize such files as configuration files for the ThinLinc Client.
You would create one .tlclient file for each system you want to connect to, and then just simply clicking them will launch the ThinLinc client preconfigured with the settings read from that file, such as host name, user name, resolution etc.
Please see 7.8.2. Configuration Parameter Storage https://www.cendio.com/resources/docs/tag/clientconf.html
Best regards,
Martin