When launching a game with a custom command, tool options do not work

[Rabcor]

System Information

• SteamTinkerLaunch version: 12.12
• Distribution: Manjaro
• Installation Method: AUR (yay)

Issue Description

If I configure a game to launch with a custom command instead of normally, None of the tool options (mangohu at least) seem to be working. If I launch the game without the custom command, it works normally.

On the other hand, if I use steam's own launch options to activate the tools (e.g. mangohud %command%) then it does work, however for some of them (like gamemode and prime-run) if they are active that way steamtinkerlaunch will take an incredibly long time (up to a couple of minutes) to load.

Tested games:
BeamNG.Drive (BeamMP)
Skyrim (SKSE)

Logs

steamtinkerlaunch.log (BeamNG)
steamtinkerlaunch.log (Skyrim)

[sonic2kk]

There is a checkbox for this on the Game Menu, grouped with the other custom program options (#732). External programs such as MangoHud are only passed when this checkbox is enabled, and when "Only custom command" is used. This is working on my end as I use this semi-frequently.

Did you forget to enable this? Based on the log it appears so as it doesn't log anything about EXTPROGS_CUSTOMCMD, but I'd like to confirm.

[Rabcor]

There is a checkbox for this on the Game Menu, grouped with the other custom program options (#732). External programs such as MangoHud are only passed when this checkbox is enabled, and when "Only custom command" is used. This is working on my end as I use this semi-frequently.

Did you forget to enable this? Based on the log it appears so as it doesn't log anything about EXTPROGS_CUSTOMCMD, but I'd like to confirm.

It was not enabled, I didn't even notice it in fact (the label doesn't make much sense to me, which is the reason), but enabling it did indeed solve this issue.

I aplogize for creating a duplicate issue, I will just shamelessly blame git's god awful issue search function (I searched 'custom command' and it did not show up on the first page, in fact there were only 2 results that even had 'custom command' in it's tags or title in the first place)