When switching from a dialog to the main Steam window by clicking on it you will hear a sound and it switches back to the dialog. However when switching using the taskbar the focus focus will stay on the main window and the sound will ring repeatedly until you switch back.
However I would prefer if it didn't lock the main window.
I'm on KDE 4.11.5

Processor:
    Leverantör:  GenuineIntel
    CPU-familj: 0x6
    CPU-modell: 0x3a
    CPU Stepping: 0x9
    CPU-typ: 0x0
    Hastighet: 3200 MHz
    4 logiska processorer
    2 fysikprocessorer
    HyperThreading:  Stöds
    FCMOV:  Stöds
    SSE2:  Stöds
    SSE3:  Stöds
    SSSE3:  Stöds
    SSE4a:  Stöds inte
    SSE41:  Stöds
    SSE42:  Stöds

Nätverk:
    Nätverkshastighet:  Mhz

Operativsystemversion:
    "openSUSE 13.1 (Bottle) (x86_64)" (64 bitar)
    Kernelnamn: Linux
    Kernelversion: 3.11.10-11-desktop
    X Serverleverantör: The X.Org Foundation
    X Serverversion: 11403901
    X Window Manager: KWin
    Version av Steam Runtime: steam-runtime-release_2014-04-15

Grafikkort:
    Drivrutin:  Intel Open Source Technology Center Mesa DRI Intel(R) Ivybridge Mobile x86/MMX/SSE2

    Version av drivrutin:  3.0 Mesa 9.2.3
    OpenGL-version: 3.0
    Skrivbordets färgdjup: 24 bitar per pixel
    Skärmens uppdateringshastighet: 60 Hz
    Leverantörs-ID hittades inte
    Enhets-ID hittades inte
    Antal skärmar:  1
    Antal grafikkort hittades inte
    Primär skärmupplösning:  1920 x 1080
    Skrivbordsupplösning: 1920 x 1080
    Primär skärmstorlek: 13,54" x 7,64"  (15,51" diag)
                                      34,4 cm x 19,4 cm  (39,4 cm diag)
    Primär VRAM hittades inte

Ljudkort:
    Ljudenhet: Intel PantherPoint HDMI

Minne:
    Arbetsminne:  15651 MB

Övrigt:
    Gränssnittsspråk:  Svenska
    SPRÅK: sv_SE.UTF-8
    Mikrofon:  Not set
    Totalt tillgängligt hårddiskutrymme:  414464 MB
    Största lediga hårddiskblock:  170457 MB

Installerad programvara:

Nyligen inträffade felrapporter:
    Thu Apr 24 21:41:58 2014 GMT: file ''/tmp/dumps/assert_20140424233950_54.dmp'', upload no: ''Couldn't connect to server''
    Sat Apr 26 22:02:55 2014 GMT: file ''/tmp/dumps/assert_20140427000216_6.dmp'', upload yes: ''CrashID=bp-314caab2-9cdc-4c81-8158-377622140426''
    Mon Apr 28 08:20:24 2014 GMT: file ''/tmp/dumps/assert_20140428102014_14.dmp'', upload yes: ''CrashID=bp-2512e7af-c4cf-45da-849c-feb902140428''
    Tue Apr 29 10:50:41 2014 GMT: file ''/tmp/dumps/assert_20140429125032_15.dmp'', upload yes: ''CrashID=bp-b6c0d14a-54ab-4aca-92de-4a76c2140429''
    Wed Apr 30 08:02:03 2014 GMT: file ''/tmp/dumps/crash_20140430100140_6.dmp'', upload yes: ''CrashID=bp-2ddbf822-ee6c-47ac-82bc-133312140430''
    Mon May  5 11:37:30 2014 GMT: file ''/tmp/dumps/assert_20140505133715_16.dmp'', upload yes: ''CrashID=bp-997ef64f-b4b7-4e81-83a5-c14592140505''
    Tue May  6 11:30:44 2014 GMT: file ''/tmp/dumps/crash_20140506133043_16.dmp'', upload no: ''Failure when receiving data from the peer''
    Wed May  7 08:32:31 2014 GMT: file ''/tmp/dumps/crash_20140507103023_6.dmp'', upload no: ''Couldn't connect to server''
    Thu May  8 22:08:13 2014 GMT: file ''/tmp/dumps/crash_20140509000750_13.dmp'', upload yes: ''CrashID=bp-63def545-b432-485c-a942-069442140508''
    Mon May 12 08:28:07 2014 GMT: file ''/tmp/dumps/assert_20140512102759_16.dmp'', upload yes: ''CrashID=bp-5b2d6bfc-57da-4309-80dd-da7cb2140512''
    Mon May 19 08:52:47 2014 GMT: file ''/tmp/dumps/assert_20140519105241_15.dmp'', upload yes: ''CrashID=bp-0a99959e-4cfb-49ff-81a6-623e32140519''
    Tue May 20 11:08:58 2014 GMT: file ''/tmp/dumps/assert_20140520130835_27.dmp'', upload yes: ''CrashID=bp-e6cc6a1d-3b1d-492b-8e78-8a3bd2140520''
    Fri May 23 08:39:01 2014 GMT: file ''/tmp/dumps/assert_20140523103821_15.dmp'', upload yes: ''CrashID=bp-dd0db4f8-0ca2-46a4-a8f6-dfcc22140523''
    Sat May 24 23:36:40 2014 GMT: file ''/tmp/dumps/assert_20140525013556_39.dmp'', upload yes: ''CrashID=bp-7b815be2-40ad-4b6f-938d-7e1612140524''
    Sat May 24 23:37:45 2014 GMT: file ''/tmp/dumps/crash_20140525011630_1.dmp'', upload yes: ''CrashID=bp-15c44884-c14b-489d-98b3-851342140524''